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Beginner Friendly Open-Source C#

Good First Issues in C#

Explore curated starter issues in high-scoring C# repositories. Every listed issue belongs to a welcoming repository scored by C-Rankβ„’ on PR merge rates, review responsiveness, and first-timer acceptance.

Updated: Sun, 30 Aug 2026 UTC (Live GitHub Sync)
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Top C# Repositories with Beginner Issues (20)

Updated Daily via GitHub GraphQL
GeiserX
whisper-subs
GeiserX/whisper-subs
Sβ€’Elite
83Β·C#

Jellyfin plugin for local AI-powered subtitle generation using Whisper - all processing stays on your server

#accessibility#ai#automation
97%
Merge Rate
2h
Review Time
100%
1st-Timers
1 GFI
Scorecard
Ozark-Connect
NetworkOptimizer
Ozark-Connect/NetworkOptimizer
Sβ€’Elite
984Β·C#

Self-hosted optimization, monitoring (NMS), and security audit tool for UniFi Networks. Includes Wi-Fi Optimizer for wireless health scoring and channel optimization, advanced DNS/VLAN/firewall security checks, config optimization suggestions, centralized WAN and LAN speed test server w/ L2 tracing, CM, ONT, SFP, 5G modem stats +more.​​​​​​​​​​​​​

#bufferbloat#docker#network-optimization
96%
Merge Rate
3d
Review Time
80%
1st-Timers
2 GFI
Scorecard
unitystation
unitystation
unitystation/unitystation
Sβ€’Elite
736Β·C#

The original unitystation

#hacktoberfest#ss13#unity
97%
Merge Rate
2d
Review Time
100%
1st-Timers
2 GFI
Scorecard
blazorblueprintui
ui
blazorblueprintui/ui
Sβ€’Elite
552Β·C#

A collection of accessible, headless primitives and beautifully-designed components for Blazor inspired by shadcn/ui.

#accessibility#aspnetcore#blazor
93%
Merge Rate
<1h
Review Time
80%
1st-Timers
1 GFI
Scorecard
ArcadeMakerSources
ArcadeMaker
ArcadeMakerSources/ArcadeMaker
Bβ€’Solid
119Β·C#

A 2D game engine with its own programming language and IDE.

#cross-platform#game-engine#ide
100%
Merge Rate
17h
Review Time
100%
1st-Timers
3 GFI
Scorecard
DotHarness
dotcraft
DotHarness/dotcraft
Sβ€’Elite
386Β·C#

An embeddable C#/.NET AI agent runtime for building extensible agents that evolve with your projects.

#agent#agent-runtime#coding-agents
96%
Merge Rate
2d
Review Time
100%
1st-Timers
1 GFI
Scorecard
sensslen
nuget-license
sensslen/nuget-license
Sβ€’Elite
168Β·C#

.NET Core tool to print or save all the licenses of a project

85%
Merge Rate
<1h
Review Time
75%
1st-Timers
1 GFI
Scorecard
Fallout-build
Fallout
Fallout-build/Fallout
Sβ€’Elite
130Β·C#

☒️ Fallout β€” The C#/.NET Build System

81%
Merge Rate
4h
Review Time
100%
1st-Timers
2 GFI
Scorecard
dotnet
docker-tools
dotnet/docker-tools
Sβ€’Elite
180Β·C#

This is a repo to house some common tools for our various docker repos.

87%
Merge Rate
20h
Review Time
88%
1st-Timers
3 GFI
Scorecard
aaru-dps
Aaru
aaru-dps/Aaru
Sβ€’Elite
611Β·C#

Aaru Data Preservation Suite

100%
Merge Rate
9h
Review Time
100%
1st-Timers
1 GFI
Scorecard
trimble-oss
dba-dash
trimble-oss/dba-dash
Sβ€’Elite
429Β·C#

DBA Dash - SQL Server Monitoring Tool

98%
Merge Rate
4d
Review Time
67%
1st-Timers
5 GFI
Scorecard
orcasound
orcahello
orcasound/orcahello
Sβ€’Elite
57Β·C#

Real-time AI-assisted killer whale notification system (model and moderator portal) :star:

#artificial-intelligence#audio-analysis#audio-processing
85%
Merge Rate
1h
Review Time
80%
1st-Timers
2 GFI
Scorecard
microsoft
OpenAPI.NET
microsoft/OpenAPI.NET
Sβ€’Elite
1.6kΒ·C#

The OpenAPI.NET SDK contains a useful object model for OpenAPI documents in .NET along with common serializers to extract raw OpenAPI JSON and YAML documents from the model.

#http#openapi
88%
Merge Rate
1d
Review Time
83%
1st-Timers
4 GFI
Scorecard
MobiFlight
MobiFlight-Connector
MobiFlight/MobiFlight-Connector
Sβ€’Elite
356Β·C#

MobiFlight is an open source project that allows you to create your own home cockpit for your favorite flight simulator in a flexible, affordable and extremely user-friendly way.

#arduino#flight-simulation#flight-simulator
85%
Merge Rate
22h
Review Time
69%
1st-Timers
9 GFI
Scorecard
nickna
SharpTS
nickna/SharpTS
Bβ€’Solid
151Β·C#

Compile TypeScript to .NET IL; Use .NET classes in Typescript

#aot#csharp#dotnet
97%
Merge Rate
2d
Review Time
100%
1st-Timers
1 GFI
Scorecard
Eppie-io
Eppie-App
Eppie-io/Eppie-App
Sβ€’Elite
411Β·C#

Eppie β€” open protocol encrypted p2p email

#cryptography#csharp#decentralization
96%
Merge Rate
7d
Review Time
67%
1st-Timers
4 GFI
Scorecard
outfox
2dog
outfox/2dog
Bβ€’Solid
179Β·C#

🦴 2dog is Godot in .NET

#csharp#dotnet#gamedev
94%
Merge Rate
2d
Review Time
100%
1st-Timers
3 GFI
Scorecard
nightscout
nocturne
nightscout/nocturne
Aβ€’Welcoming
111Β·C#

A next-generation platform for diabetes management

#cgm#cgm-remote-monitor#diabetes
89%
Merge Rate
2d
Review Time
100%
1st-Timers
1 GFI
Scorecard
ElectronNET
Electron.NET
ElectronNET/Electron.NET
Aβ€’Welcoming
7.6kΒ·C#

:electron: Build cross platform desktop apps with ASP.NET Core (Razor Pages, MVC, Blazor).

#asp-net-core#asp-net-core-mvc#aspnet
95%
Merge Rate
10d
Review Time
100%
1st-Timers
5 GFI
Scorecard
dotnet
BenchmarkDotNet
dotnet/BenchmarkDotNet
Aβ€’Welcoming
11.5kΒ·C#

Powerful .NET library for benchmarking

85%
Merge Rate
8h
Review Time
100%
1st-Timers
1 GFI
Scorecard

How to make your first C# open-source pull request

Finding approachable Good First Issues in C# allows you to build real-world software engineering experience. Instead of submitting PRs to abandoned repositories, GetMerged verifies maintainer review speeds and first-timer acceptance rates before you write a single line of code.

Select any issue above to claim it directly on GitHub, or click a repository to inspect full maintainer review turnaround metrics and triage guidance!

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