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Good First Issue curates easy pickings from popular open-source projects, and helps you make your first contribution to open-source.

MonoDevelop is a cross platform .NET IDE
lang: C#
stars: 2.6K
last activity: 2 days ago
Build Mobile, Desktop and WebAssembly apps with C# and XAML. Today. Open source and professionally supported.
lang: C#
stars: 4.32K
last activity: 12 minutes ago
.NET core API Gateway
lang: C#
stars: 5.89K
last activity: 23 minutes ago
A cross-platform plotting library for .NET
lang: C#
stars: 2.16K
last activity: 2 hours ago
mono / mono
Mono open source ECMA CLI, C# and .NET implementation.
lang: C#
stars: 9.08K
last activity: 3 hours ago
The best C# command line parser that brings standardized *nix getopt style, for .NET. Includes F# support
lang: C#
stars: 2.54K
last activity: 7 hours ago
Google's Material Design in XAML & WPF, for C# & VB.Net.
lang: C#
stars: 10.2K
last activity: 14 minutes ago
Lean Algorithmic Trading Engine by QuantConnect (C#, Python, F#)
lang: C#
stars: 4.39K
last activity: 7 hours ago
Every programmer needs a rubberduck. COM add-in for the VBA & VB6 IDE (VBE).
lang: C#
stars: 1.24K
last activity: 2 days ago
dotnet / efcore
EF Core is a modern object-database mapper for .NET. It supports LINQ queries, change tracking, updates, and schema migrations.
lang: C#
stars: 9.84K
last activity: 6 hours ago
An open source fork of Windows Live Writer
lang: C#
stars: 2.36K
last activity: 2 days ago
Command line parsing, invocation, and rendering of terminal output.
lang: C#
stars: 1.79K
last activity: 2 hours ago
One framework for creating powerful cross-platform games.
lang: C#
stars: 7.28K
last activity: 9 hours ago
Linq to database provider.
lang: C#
stars: 1.94K
last activity: 2 days ago
A cross platform, self-hosted server compatible with Bitpay API
lang: C#
stars: 1.76K
last activity: 22 minutes ago
xunit / xunit
xUnit.net is a free, open source, community-focused unit testing tool for the .NET Framework.
lang: C#
stars: 2.76K
last activity: 20 hours ago
Free and Open Source Ecommerce Shopping Cart solution based on ASP.NET CORE and MongoDB
lang: C#
stars: 1.53K
last activity: a day ago
Python for .NET is a package that gives Python programmers nearly seamless integration with the .NET Common Language Runtime (CLR) and provides a powerful application scripting tool for .NET developers.
lang: C#
stars: 2.42K
last activity: 3 hours ago
🦄 .NET orm, Mysql orm, Postgresql orm, SqlServer orm, Oracle orm, Sqlite orm, Firebird orm, 达梦 orm, 人大金仓 orm, 神通 orm, 翰高 orm, 华为GaussDB orm, MsAccess orm.
lang: C#
stars: 2.58K
last activity: 2 hours ago
ML.NET is an open source and cross-platform machine learning framework for .NET.
lang: C#
stars: 7.35K
last activity: 5 hours ago
winsw / winsw
A wrapper executable that can run any executable as a Windows service, in a permissive license.
lang: C#
stars: 5.15K
last activity: 2 hours ago
ASP.NET Core is a cross-platform .NET framework for building modern cloud-based web applications on Windows, Mac, or Linux.
lang: C#
stars: 20.69K
last activity: 2 hours ago
dotnet / spark
.NET for Apache® Spark™ makes Apache Spark™ easily accessible to .NET developers.
lang: C#
stars: 1.59K
last activity: 12 hours ago
Powerful .NET library for benchmarking
lang: C#
stars: 6.14K
last activity: 12 hours ago
Headless Chrome .NET API
lang: C#
stars: 1.67K
last activity: 6 hours ago
AutoFixture is an open source library for .NET designed to minimize the 'Arrange' phase of your unit tests in order to maximize maintainability. Its primary goal is to allow developers to focus on what is being tested rather than how to setup the test scenario, by making it easier to create object graphs containing test data.
lang: C#
stars: 2.14K
last activity: 2 days ago