Contribute to an Open Sustain Open Source Project

Find an issue that you can help with. Contribute to the project and help sustain the planet.

#1007 - Unclear attribute of Hazard class

Project: CLIMADA - Climate Change - Natural Hazard and Storms - Jupyter Notebook
Opened by chahank about 1 year ago - Last Updated about 1 year ago - 0 comments
good first issue bugfix

#1339 - Review Introduction of pypsa-earth in documentation to cover more on sector-couple.

Project: PyPSA-Earth - Energy Systems - Global and Regional Energy System Models - Python
Opened by GbotemiB about 1 year ago - Last Updated about 1 year ago - 0 comments
documentation good first issue

#1338 - Standardize Usage Section Format

Project: PyPSA-Earth - Energy Systems - Global and Regional Energy System Models - Python
Opened by GbotemiB about 1 year ago - Last Updated about 1 year ago - 0 comments
documentation good first issue

#1336 - Improve Installation Guide Structure

Project: PyPSA-Earth - Energy Systems - Global and Regional Energy System Models - Python
Opened by GbotemiB about 1 year ago - Last Updated about 1 year ago - 0 comments
documentation good first issue

#1335 - Fix Grammar Issues Across Documentation

Project: PyPSA-Earth - Energy Systems - Global and Regional Energy System Models - Python
Opened by GbotemiB about 1 year ago - Last Updated about 1 year ago - 0 comments
documentation good first issue

#1162 - Improve the documentation on time series resolution inputs

Project: SpineOpt.jl - Energy Systems - Energy System Modeling Frameworks - Julia
Opened by datejada about 1 year ago - Last Updated about 1 year ago - 0 comments
good first issue Zone: documentation Type: improvement

#135 - [Paper] Fixing the Double Penalty in Data-Driven Weather Forecasting Through a Modified Spherical Harmonic Loss Function

Project: Graph Weather - Atmosphere - Meteorological Observation and Forecast - Python
Opened by jacobbieker about 1 year ago - Last Updated about 1 year ago - 0 comments
enhancement good first issue

#148 - Review vignettes

Project: weathercan - Atmosphere - Meteorological Observation and Forecast - R
Opened by steffilazerte about 1 year ago - Last Updated about 2 months ago - 2 comments
help wanted documentation good first issue

#861 - Update documentation on `validate_oseries` and `validate_series`

Project: Pastas - Hydrosphere - Freshwater and Hydrology - Python
Opened by mbakker7 about 1 year ago - Last Updated 4 months ago - 0 comments
documentation good-first-issue

#912 - [Feature request]: add support for SDongle registers

Project: huawei_solar - Renewable Energy - Photovoltaics and Solar Energy - Python
Opened by hedkvist about 1 year ago - Last Updated 6 months ago - 8 comments
enhancement help wanted on-hold

#133 - Add support for evaluating on ExtremeWeatherBench

Project: Graph Weather - Atmosphere - Meteorological Observation and Forecast - Python
Opened by jacobbieker about 1 year ago - Last Updated 8 months ago - 25 comments
enhancement good first issue

#556 - Separate status bar for Sites view on Quartz Solar

Project: Solar electricity Nowcasting - Renewable Energy - Photovoltaics and Solar Energy - TypeScript
Opened by braddf about 1 year ago - Last Updated 7 months ago - 5 comments
enhancement good first issue

#108 - Plotting Boundaries in `train_model.py --eval` not just interior

Project: Neural-LAM - Atmosphere - Meteorological Observation and Forecast - Python
Opened by sadamov about 1 year ago - Last Updated about 1 year ago - 0 comments
enhancement help wanted

#7769 - BB production parser down

Project: Electricity Maps - Emissions - Carbon Intensity and Accounting - Python
Opened by electricitymapsbot about 1 year ago - Last Updated about 1 year ago - 0 comments
help wanted parser

#786 - Add HeatPump:PlantLoop:EIR:(Heating/cooling)

Project: OpenStudio - Consumption - Buildings and Heating - C++
Opened by jmarrec about 1 year ago - Last Updated about 1 year ago - 0 comments
Enhancement Request good first issue component - UI

#2366 - Intro tutorial: different results for Procedural and Object oriented examples

Project: pvlib-python - Renewable Energy - Photovoltaics and Solar Energy - Python
Opened by cwhanse about 1 year ago - Last Updated about 1 year ago - 0 comments
bug documentation easy good first issue

#515 - [OpenSSF] Addressing Warnings

Project: xscen - Climate Change - Climate Data Processing and Analysis - Python
Opened by Zeitsperre about 1 year ago - Last Updated about 1 year ago - 0 comments
good first issue help wanted

#109 - Make GOES data explorer/downloader with pyscript

Project: goes2go - Sustainable Development - Environmental Satellites - Python
Opened by blaylockbk about 1 year ago - Last Updated 9 months ago - 3 comments
enhancement help wanted

#67 - Make it easier to create a custom domain

Project: OpenMethane - Emissions - Emission Observation and Modeling - Python
Opened by aethr about 1 year ago - Last Updated 7 months ago - 0 comments
documentation enhancement help wanted

#2720 - Document how to migrate away from init_group in v3

Project: Zarr - Climate Change - Climate Data Standards - Python
Opened by dstansby about 1 year ago - Last Updated about 1 year ago - 1 comment
help wanted documentation

#889 - Add seperate config for predict batch size and train batch size.

Project: DeepForest - Biosphere - Forest Remote Sensing - Python
Opened by bw4sz about 1 year ago - Last Updated about 1 year ago - 0 comments
good first issue

#6904 - EAMxx: clean up now-unneeded, then-needed barriers in shoc energy integrals

Project: E3SM - Climate Change - Earth and Climate Modeling - Fortran
Opened by mahf708 about 1 year ago - Last Updated about 1 year ago - 0 comments
help wanted EAMxx

#4076 - [feature] Move form field errors to below the field

Project: ONEARMY - Sustainable Development - Knowledge Platforms - TypeScript
Opened by mariojsnunes about 1 year ago - Last Updated about 1 year ago - 0 comments
Good first issue Frontend

#6899 - EAMxx: vert_contraction does not take advantage of packs on CPU

Project: E3SM - Climate Change - Earth and Climate Modeling - Fortran
Opened by mahf708 about 1 year ago - Last Updated about 1 year ago - 0 comments
enhancement help wanted EAMxx

#381 - [ENH]: Add new energyprice provider energy-charts.info

Project: AkkudoktorEOS - Energy Systems - Energy System Modeling Frameworks - Python
Opened by NormannK about 1 year ago - Last Updated 10 months ago - 4 comments
enhancement good first issue stale

#369 - dscim tests seem to fail when using zarr >= v3.x package

Project: DSCIM - Emissions - Carbon Intensity and Accounting - Python
Opened by brews about 1 year ago - Last Updated about 1 year ago - 0 comments
bug help wanted

#165 - Add proper logging to repository

Project: Energy System Technology Data - Energy Systems - Energy Data Accessibility and Integration - Python
Opened by euronion about 1 year ago - Last Updated about 1 year ago - 0 comments
enhancement help wanted

#35 - Propose some data structures for scattering model data

Project: echoSMs - Biosphere - Marine Life and Fishery - Python
Opened by gavinmacaulay about 1 year ago - Last Updated 3 months ago - 2 comments
help wanted

#3859 - Wärmepumpe vor SENEC EnFluRi - wie richtig Konfigurieren (+Power-Splitter)

Project: SOLECTRUS - Renewable Energy - Photovoltaics and Solar Energy - Ruby
Opened by unclej84 about 1 year ago - Last Updated about 1 year ago - 0 comments
help wanted

#892 - USDA Natural Resources Conservation Service - SNOTEL sites - SOAP API

Project: ACT - Atmosphere - Atmospheric Composition and Dynamics - Python
Opened by jrobrien91 about 1 year ago - Last Updated about 1 year ago - 0 comments
enhancement good first issue

#478 - a good 3d example is missing

Project: tobac - Atmosphere - Atmospheric Chemistry and Aerosol - Python
Opened by fsenf about 1 year ago - Last Updated 11 months ago - 6 comments
enhancement good first issue documentation Tobathon 2025

#1495 - GPU backend is missing the `a_w_ice` method (test present)

Project: PySDM - Atmosphere - Atmospheric Chemistry and Aerosol - Python
Opened by slayoo about 1 year ago - Last Updated about 1 year ago - 0 comments
good first issue ice

#877 - Make the examples section in the docs clearer in the sidebar.

Project: DeepForest - Biosphere - Forest Remote Sensing - Python
Opened by bw4sz about 1 year ago - Last Updated about 1 year ago - 0 comments
good first issue Docs

#1363 - Review and Clean up Exploration types & Veda Types for Dataset Layers

Project: VEDA Dashboard - Sustainable Development - Data Catalogs and Interfaces - TypeScript
Opened by sandrahoang686 about 1 year ago - Last Updated 3 months ago - 2 comments
good first issue tech debt veda v2 typescript

#850 - Add notebook introducing model checks

Project: Pastas - Hydrosphere - Freshwater and Hydrology - Python
Opened by raoulcollenteur about 1 year ago - Last Updated about 1 year ago - 0 comments
development good-first-issue

#344 - missing test for _request_forecast in elecpriceakkudoktor.py

Project: AkkudoktorEOS - Energy Systems - Energy System Modeling Frameworks - Python
Opened by NormannK about 1 year ago - Last Updated about 1 year ago - 0 comments
enhancement good first issue

#725 - Broadening with multiple species

Project: radis - Atmosphere - Radiative Transfer - Python
Opened by minouHub about 1 year ago - Last Updated about 1 year ago - 0 comments
enhancement good first issue physics db:exomol

#2646 - DOC: deprecated stores

Project: Zarr - Climate Change - Climate Data Standards - Python
Opened by DimitriPapadopoulos about 1 year ago - Last Updated about 1 year ago - 0 comments
help wanted documentation

#58 - Update to new openjson

Project: elexonpy - Energy Systems - Energy Data Accessibility and Integration - Python
Opened by peterdudfield about 1 year ago - Last Updated 8 months ago - 6 comments
good first issue

#2611 - DOC: write_empty_chunks

Project: Zarr - Climate Change - Climate Data Standards - Python
Opened by d-v-b about 1 year ago - Last Updated about 1 year ago - 0 comments
help wanted documentation

#2587 - DOC: docs is not helping in plz help

Project: Zarr - Climate Change - Climate Data Standards - Python
Opened by xalteropsx about 1 year ago - Last Updated about 1 year ago - 0 comments
help wanted documentation

#1387 - [1pt] PR: Bug fixes for test_cases

Project: Inundation Mapping - Climate Change - Natural Hazard and Storms - Python
Opened by mluck about 1 year ago - Last Updated about 1 year ago - 0 comments
bug testing good first issue

#7618 - feat(web): retain scroll position in details view when selecting another zone/country

Project: Electricity Maps - Emissions - Carbon Intensity and Accounting - Python
Opened by consideRatio about 1 year ago - Last Updated about 2 months ago - 4 comments
help wanted Frontend 🎨 javascript

#619 - Question on general CMIP inquiry of mass balance

Project: NorESM - Climate Change - Earth and Climate Modeling - Python
Opened by oyvindseland about 1 year ago - Last Updated about 1 year ago - 0 comments
question & help wanted Evaluation&Analysis

#1643 - Skeleton tips easily overwritten within the `plantcv.morphology` sub-package

Project: PlantCV - Biosphere - Plants and Vegetation - Python
Opened by HaleySchuhl about 1 year ago - Last Updated about 1 year ago - 0 comments
help wanted

#2574 - DOC: Using Zarr with GPU arrays

Project: Zarr - Climate Change - Climate Data Standards - Python
Opened by jhamman about 1 year ago - Last Updated about 1 year ago - 0 comments
help wanted documentation

#6266 - Add benchmark(s) for interpolation

Project: Iris - Climate Change - Climate Data Processing and Analysis - Python
Opened by trexfeathers about 1 year ago - Last Updated about 1 year ago - 0 comments
Type: Performance Type: Testing Good First Issue

#859 - Don't run on_validation_epoch_end() during sanity checking if val-accuracy-interval is greater than max epochs.

Project: DeepForest - Biosphere - Forest Remote Sensing - Python
Opened by bw4sz about 1 year ago - Last Updated about 1 year ago - 0 comments
good first issue API

#7216 - Fan Type help text gone

Project: AMO-Tools-Desktop - Consumption - Production and Industry - TypeScript
Opened by koay9f about 1 year ago - Last Updated about 1 year ago - 0 comments
bug Fans Help Text

#2025 - [OpenSSF] Raising our bus factor

Project: xclim - Climate Change - Climate Data Processing and Analysis - Python
Opened by Zeitsperre about 1 year ago - Last Updated about 1 year ago - 0 comments
enhancement help wanted standards / conventions

#7557 - Exchange arrow positions are off in California

Project: Electricity Maps - Emissions - Carbon Intensity and Accounting - Python
Opened by madsnedergaard about 1 year ago - Last Updated about 1 year ago - 0 comments
help wanted good first issue app

#1229 - Move `with_units` here from PowerFlows.jl

Project: PowerSystems.jl - Energy Systems - Energy System Modeling Frameworks - Julia
Opened by GabrielKS about 1 year ago - Last Updated about 1 year ago - 0 comments
enhancement good first issue

#7207 - pump achieveable efficiency help addition

Project: AMO-Tools-Desktop - Consumption - Production and Industry - TypeScript
Opened by koay9f about 1 year ago - Last Updated about 1 year ago - 0 comments
Pumps Help Text

#67 - Multi-Station Timeseries not working

Project: SynopticPy - Sustainable Development - Data Catalogs and Interfaces - Python
Opened by blaylockbk about 1 year ago - Last Updated about 1 year ago - 2 comments
help wanted pyscript

#637 - Use latest version of dashboards in the documentation and Readme

Project: CloudScanner - Consumption - Computation and Communication - Rust
Opened by demeringo about 1 year ago - Last Updated about 1 year ago - 0 comments
documentation good first issue

#98 - Update docs to match current run methods

Project: Pace - Atmosphere - Atmospheric Composition and Dynamics - Python
Opened by fmalatino about 1 year ago - Last Updated about 1 year ago - 0 comments
documentation good first issue

#849 - Better expose and document batch prediction from dataloaders

Project: DeepForest - Biosphere - Forest Remote Sensing - Python
Opened by bw4sz about 1 year ago - Last Updated about 1 year ago - 0 comments
good first issue API

#2550 - DOC: `zarr.tree()` is deprecated

Project: Zarr - Climate Change - Climate Data Standards - Python
Opened by DimitriPapadopoulos about 1 year ago - Last Updated about 1 year ago - 0 comments
help wanted documentation

#2916 - [Code health] Use `snake_case` for all XML IDs for consistency

Project: Ground for Android - Biosphere - Conservation and Restoration - Kotlin
Opened by gino-m about 1 year ago - Last Updated about 1 year ago - 0 comments
good first issue type: code health

#65 - Team Achievements Update

Project: WordPress Sustainability Handbook - Consumption - Computation and Communication
Opened by CeliGaroe about 1 year ago - Last Updated about 1 year ago - 0 comments
documentation good first issue help wanted admin

#231 - CI tests take 20 mins

Project: Quartz Solar Forecast - Renewable Energy - Photovoltaics and Solar Energy - Jupyter Notebook
Opened by peterdudfield about 1 year ago - Last Updated about 1 month ago - 13 comments
good first issue

#13021 - [Missing translation] "none" is not translatable - Follow up from #13018

Project: openfoodnetwork - Consumption - Agriculture and Nutrition - Ruby
Opened by filipefurtad0 about 1 year ago - Last Updated about 1 year ago - 0 comments
good first issue

#6840 - EAMXX: improve composability of diags (especially field_at_xyz)

Project: E3SM - Climate Change - Earth and Climate Modeling - Fortran
Opened by mahf708 about 1 year ago - Last Updated about 1 year ago - 0 comments
help wanted EAMxx

#3959 - Signalements – Copier-coller le commentaire d'un préavis dans la description du signalement

Project: Monitorfish - Biosphere - Marine Life and Fishery - TypeScript
Opened by AdelineCelier about 1 year ago - Last Updated 8 months ago - 1 comment
feat. enhancement dev good first issue

#2529 - cannot install antares on windows

Project: Antares Simulator - Energy Systems - Energy System Modeling Frameworks - C
Opened by juliana-steinbach about 1 year ago - Last Updated about 1 year ago - 0 comments
help wanted

#336 - boundingbox doesn't work on a vector of Occurrence not wrapped in an Occurrences object

Project: SpeciesDistributionToolkit - Biosphere - Species Distribution Modeling - Julia
Opened by tpoisot about 1 year ago - Last Updated about 1 year ago - 0 comments
bug priority:low effort:low good first issue

#553 - Help with BIOMOD_xxx - [changing from 3.5.1 functions]

Project: biomod2 - Biosphere - Species Distribution Modeling - R
Opened by ReproducibleScienceAssessment about 1 year ago - Last Updated about 1 year ago - 0 comments
help wanted

#6804 - EAMxx: bringing nudging in IOP out to the eamxx nudging module

Project: E3SM - Climate Change - Earth and Climate Modeling - Fortran
Opened by mahf708 about 1 year ago - Last Updated about 1 year ago - 0 comments
help wanted EAMxx

#6803 - EAMxx: intelligently handle fillval tracking in diags

Project: E3SM - Climate Change - Earth and Climate Modeling - Fortran
Opened by mahf708 about 1 year ago - Last Updated 7 months ago - 15 comments
help wanted EAMxx

#63 - Introduce "Sustainable Events Handbook" on the WordCamp Organizer Handbook

Project: WordPress Sustainability Handbook - Consumption - Computation and Communication
Opened by CeliGaroe about 1 year ago - Last Updated about 1 year ago - 0 comments
good first issue help wanted Environmental

#1105 - Full docstring coverage

Project: PyPSA - Energy Systems - Energy System Modeling Frameworks - Python
Opened by lkstrp about 1 year ago - Last Updated about 1 year ago - 0 comments
documentation good first issue

#9852 - Deprecate built-in iris conversion in favor of ncData

Project: xarray - Climate Change - Climate Data Standards - Python
Opened by dcherian about 1 year ago - Last Updated about 1 year ago - 0 comments
contrib-help-wanted

#551 - Help with BIOMOD_xxx - Changing format of model output

Project: biomod2 - Biosphere - Species Distribution Modeling - R
Opened by dmh382 about 1 year ago - Last Updated about 1 year ago - 0 comments
help wanted

#554 - [HELP] Sentinel2-L2A processing baseline 5 products

Project: sentinelhub-py - Sustainable Development - Environmental Satellites - Python
Opened by kalfasyan about 1 year ago - Last Updated about 1 year ago - 0 comments
help wanted question

#1208 - Add sector-coupled configuration to docs

Project: PyPSA-Earth - Energy Systems - Global and Regional Energy System Models - Python
Opened by energyLS about 1 year ago - Last Updated about 1 year ago - 0 comments
documentation help wanted good first issue

#496 - dewmm and cansto units change

Project: CABLE - Climate Change - Earth and Climate Modeling - Fortran
Opened by JhanSrbinovsky about 1 year ago - Last Updated about 1 year ago - 0 comments
good first issue

#2461 - Modelling transformers with asymmetric charged susceptance

Project: pandapower - Energy Systems - Energy System Modeling Frameworks - Python
Opened by eperim about 1 year ago - Last Updated 8 months ago - 13 comments
help wanted! feature question

#550 - Help with BIOMOD_4.2-5-2 - GAM and MaxEnt modeling runs failed

Project: biomod2 - Biosphere - Species Distribution Modeling - R
Opened by CYJun-gh about 1 year ago - Last Updated about 1 year ago - 0 comments
help wanted

#4014 - [feat] Fixing behaviour of icons of 'Follow' and 'Mark as useful' buttons

Project: ONEARMY - Sustainable Development - Knowledge Platforms - TypeScript
Opened by dalibormrska about 1 year ago - Last Updated about 1 year ago - 0 comments
Good first issue Frontend Difficulty:Super-Easy Design Approved

#1138 - Dev-Meeting working on results

Project: oemof-solph - Energy Systems - Energy System Modeling Frameworks - Python
Opened by AntonellaGia about 1 year ago - Last Updated about 1 year ago - 15 comments
help wanted decision wanted announcement

#597 - Remove unsupported grids?

Project: NorESM - Climate Change - Earth and Climate Modeling - Python
Opened by gold2718 about 1 year ago - Last Updated about 1 year ago - 0 comments
question & help wanted

#2458 - [feature] Improved error handling

Project: pandapower - Energy Systems - Energy System Modeling Frameworks - Python
Opened by vogt31337 about 1 year ago - Last Updated about 1 year ago - 0 comments
help wanted! enhancement

#208 - main: handle error for app.Listen

Project: OpenFish - Biosphere - Marine Life and Fishery - Go
Opened by trekhopton about 1 year ago - Last Updated about 1 year ago - 0 comments
good first issue chore

#688 - Update references to NCAR to NSF NCAR

Project: MICM Chemistry - Atmosphere - Atmospheric Chemistry and Aerosol - C++
Opened by mattldawson about 1 year ago - Last Updated about 1 year ago - 0 comments
documentation good first issue

#547 - Help with BIOMOD2_BIOMOD_RangeSize Function (must have values among 0,1 or NA)

Project: biomod2 - Biosphere - Species Distribution Modeling - R
Opened by Abshup22 about 1 year ago - Last Updated about 1 year ago - 0 comments
help wanted

#65 - Make Alumet increases its Linux resource limits automatically

Project: ALUMET - Consumption - Computation and Communication - Rust
Opened by TheElectronWill about 1 year ago - Last Updated about 1 year ago - 0 comments
T:ux good first issue D:medium

#542 - Help with BIOMOD_4.2-6.1 - ensemble forecasting with different # of PA

Project: biomod2 - Biosphere - Species Distribution Modeling - R
Opened by amythor about 1 year ago - Last Updated about 1 year ago - 0 comments
help wanted

#36 - New Maintainer Wanted :-)

Project: hddtools - Hydrosphere - Ocean and Hydrology Data Access - R
Opened by maelle about 1 year ago - Last Updated about 1 year ago - 0 comments
help wanted

#551 - raw response

Project: sentinelhub-py - Sustainable Development - Environmental Satellites - Python
Opened by Simoniman about 1 year ago - Last Updated about 1 year ago - 0 comments
help wanted question

#9791 - Support DataTree in xarray.align

Project: xarray - Climate Change - Climate Data Standards - Python
Opened by shoyer about 1 year ago - Last Updated about 1 year ago - 0 comments
contrib-help-wanted topic-DataTree

#9790 - Support DataTree in xarray.merge

Project: xarray - Climate Change - Climate Data Standards - Python
Opened by shoyer about 1 year ago - Last Updated about 1 year ago - 3 comments
contrib-help-wanted topic-DataTree

#9789 - Support DataTree in apply_ufunc

Project: xarray - Climate Change - Climate Data Standards - Python
Opened by shoyer about 1 year ago - Last Updated about 1 year ago - 0 comments
contrib-help-wanted topic-DataTree

#174 - Assign data names to new ecodata indicators

Project: ecodata - Biosphere - Marine Life and Fishery - HTML
Opened by BBeltz1 over 1 year ago - Last Updated over 1 year ago - 0 comments
help wanted

#1613 - Field table yaml documentation

Project: The Flexible Modeling System - Climate Change - Earth and Climate Modeling - Fortran
Opened by uramirez8707 over 1 year ago - Last Updated about 1 year ago - 0 comments
enhancement help wanted documentation

#607 - Use real time carbon intensity factors

Project: CloudScanner - Consumption - Computation and Communication - Rust
Opened by jnioche over 1 year ago - Last Updated over 1 year ago - 0 comments
enhancement help wanted

#36 - Add list of variables to documentation

Project: OpenAirClim - Emissions - Emission Observation and Modeling - Python
Opened by stefan-voelk over 1 year ago - Last Updated over 1 year ago - 0 comments
type: docs good first issue module: core

#35 - Add capability for various units in background files

Project: OpenAirClim - Emissions - Emission Observation and Modeling - Python
Opened by stefan-voelk over 1 year ago - Last Updated over 1 year ago - 0 comments
type: feature good first issue module: construct_conc

#33 - Add plotting functionalities

Project: OpenAirClim - Emissions - Emission Observation and Modeling - Python
Opened by stefan-voelk over 1 year ago - Last Updated over 1 year ago - 0 comments
type: feature good first issue module: plot

#31 - Add normal distribution inventories

Project: OpenAirClim - Emissions - Emission Observation and Modeling - Python
Opened by stefan-voelk over 1 year ago - Last Updated over 1 year ago - 0 comments
type: feature good first issue module: utils

#326 - Logger not used correctly

Project: DPsim - Energy Systems - Energy System Modeling Frameworks - C++
Opened by leonardocarreras over 1 year ago - Last Updated 4 months ago - 5 comments
bug good first issue