mcintyre321 / OneOf

Easy to use F#-like ~discriminated~ unions for C# with exhaustive compile time matching

wiremock / WireMock.Net

WireMock.Net is a flexible product for stubbing and mocking web HTTP responses using advanced request matching and response templating. Based on WireMock Java, but extended and different functionality. Full documentation can be found at https://wiremock.org/dotnet/.

NRules / NRules

Rules engine for .NET, based on the Rete matching algorithm, with internal DSL in C#.

TuralSuleymani / Rovio.Matchmaking

A production-shaped, DDD-inspired .NET service for multi-game queues (latency + wait-time matching). Built as a game-server architecture showcase.