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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.

Headless Chrome .NET API
lang: C#
stars: 2.06K
last activity: 2 days ago
ML.NET is an open source and cross-platform machine learning framework for .NET.
lang: C#
stars: 7.7K
last activity: a day ago
An open source fork of Windows Live Writer
lang: C#
stars: 2.4K
last activity: 8 months ago
xunit / xunit
xUnit.net is a free, open source, community-focused unit testing tool for the .NET Framework.
lang: C#
stars: 3.05K
last activity: 4 hours ago
The best C# command line parser that brings standardized *nix getopt style, for .NET. Includes F# support
lang: C#
stars: 3.12K
last activity: 5 days ago
Build Mobile, Desktop and WebAssembly apps with C# and XAML. Today. Open source and professionally supported.
lang: C#
stars: 5.84K
last activity: 11 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: 2.44K
last activity: 24 days ago
High performance and modular controls for node-based editors designed for data-binding and MVVM.
lang: C#
stars: 243
last activity: 17 days ago
One framework for creating powerful cross-platform games.
lang: C#
stars: 7.87K
last activity: a day 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: 10.69K
last activity: 12 hours ago
A cross-platform plotting library for .NET
lang: C#
stars: 2.4K
last activity: 5 days ago
winsw / winsw
A wrapper executable that can run any executable as a Windows service, in a permissive license.
lang: C#
stars: 6.3K
last activity: 2 days ago
Google's Material Design in XAML & WPF, for C# & VB.Net.
lang: C#
stars: 11.37K
last activity: 8 days 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: 26.2K
last activity: 4 hours ago
Every programmer needs a rubberduck. COM add-in for the VBA & VB6 IDE (VBE).
lang: C#
stars: 1.44K
last activity: 18 hours ago
Command line parsing, invocation, and rendering of terminal output.
lang: C#
stars: 2.32K
last activity: 3 days ago
MonoDevelop is a cross platform .NET IDE
lang: C#
stars: 2.68K
last activity: 20 days ago
💫 NClient is an automatic type-safe .Net HTTP client that allows you to call web service API methods using annotated interfaces or controllers without boilerplate code.
lang: C#
stars: 14
last activity: 14 hours ago
Powerful .NET library for benchmarking
lang: C#
stars: 7K
last activity: 11 days 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: 2.76K
last activity: 2 days ago
Accept Bitcoin payments. Free, open-source & self-hosted, Bitcoin payment processor.
lang: C#
stars: 3.02K
last activity: 2 hours ago
mono / mono
Mono open source ECMA CLI, C# and .NET implementation.
lang: C#
stars: 9.52K
last activity: 2 days ago
Open source, headless, multi-tenant eCommerce platform built with .NET Core, MongoDB, AWS DocumentDB, Azure CosmosDB, Vue.js.
lang: C#
stars: 1.75K
last activity: 2 months ago
Linq to database provider.
lang: C#
stars: 2.17K
last activity: 3 hours ago
:cake: Cake (C# Make) is a cross platform build automation system.
lang: C#
stars: 3.09K
last activity: 9 hours ago
.NET core API Gateway
lang: C#
stars: 6.58K
last activity: 8 days ago
Lean Algorithmic Trading Engine by QuantConnect (C#, Python)
lang: C#
stars: 5.5K
last activity: a day ago
dotnet / spark
.NET for Apache® Spark™ makes Apache Spark™ easily accessible to .NET developers.
lang: C#
stars: 1.7K
last activity: 9 days ago