Open source. Open possibilities.

Self-hosted privacy-friendly product analytics for ASP.NET Core. Collects telemetry events using EF Core and SQL Server without relying on third-party tracking services, with built-in data minimization, allow-listing, and rate limiting.

AutoSSH is a .NET application for SSH automation and backup across Windows and Linux. It supports centralized command execution, parallel host processing, and efficient async downloads with configurable concurrency settings.

OpenRA is a free/libre real-time strategy game engine for early Westwood classics like Command & Conquer: Red Alert, Tiberian Dawn and Dune 2000. It is written in C# with SDL/OpenGL, runs on Windows, Linux, BSD and macOS, and offers mapping, modding and dedicated server tools.

A Clean Architecture solution template for ASP.NET Core, distributed as a dotnet CLI template. It provides layered Core, Use Cases, Infrastructure and Web projects with tests, plus full and minimal variants.

FlatRedBall is a cross-platform 2D game engine built with .NET and C#, featuring a dedicated editor to enhance developer productivity.

An open-source developer platform for building native cross-platform .NET applications for Web, Desktop, Mobile, and Embedded systems from a single C#/XAML codebase.

Nakama is an open-source game backend server from Heroic Labs. It provides users, storage, social graph, chat, realtime and turn-based multiplayer, leaderboards, tournaments, parties, purchase validation, notifications and runtime code.

ML.NET is an open-source, cross-platform machine learning framework for .NET that lets developers build, train, deploy, and consume custom models directly in .NET apps without needing Python or R.

Kahuna is an open-source distributed systems toolkit providing distributed locking, a fault-tolerant key/value store, and globally ordered ID sequencing, built on Raft consensus and MVCC.

LiteDB is a lightweight, serverless NoSQL embedded database for .NET that stores data in a single file, offering ACID transactions, LINQ queries, and a MongoDB‑like API while remaining under 450 KB.

A strongly-typed .NET wrapper for FFmpeg and FFprobe, providing a fluent API for media transcoding, trimming, merging, and watermarking.

Read-only-by-default Model Context Protocol (MCP) server for Microsoft SQL Server, providing metadata discovery, parameterized SELECT-only queries, execution plan analysis for slow query diagnosis, profile-based multi-connection configuration, and optional per-profile write access, shipped as a .NET NuGet tool.

SMTP Tool is a portable Windows desktop application for testing, diagnosing, and debugging SMTP servers. It supports TLS 1.3, real-time open/click tracking via local HTTP server, latency benchmarking, and interactive protocol terminal.

A Windows desktop utility for managing and switching authentication accounts for AI coding tools like Codex and Claude Code. It provides a GUI to add accounts, switch active credentials, monitor usage quotas, and display real-time usage in the taskbar.

A transport-agnostic OAuth 2.1 and OpenID Connect server built on OpenIddict and redb.Route, supporting multiple databases, MFA, WebAuthn, SCIM, and in-process direct-vm calls.

rzeka is a single-threaded reactive event bus for C# built on Rx.NET that features automatic causality tracking and a real-time browser-based debugger.

Soenneker.Loops.Contacts is a .NET utility library for managing Loops contacts by email. It provides create, update, find, and delete operations, configuration through a Loops API key, and scoped or singleton dependency injection registration.

BarakoCMS is a headless, API-first CMS suite for .NET 10 featuring an event-sourced engine, multi-tenancy, and a modular architecture.

TUnit-native math assertion library for .NET: fluent tolerance, sequence, statistics, linear algebra, number theory, and 3D geometry assertions generated into TUnit's Assert.That pipeline; AOT-compatible and reflection-free.

A .NET library for multi-tenant SQLite: per-tenant file isolation or shared-schema scoping, integrity checks across tenants, tenant context helpers, rate limiting and error middleware validation, plus settings and JSON utilities.