hermanussen 

Analyzer that checks references from code to different namespaces, based on your own rules

Generates code on build that allows reading Json in a typed structure, based on example Json.

A Roslyn analyzer that verifies if Sitecore ID's and paths are valid in serialized Unicorn data (the Rainbow format)

A C# mocking library that generates mocks at compile-time using a source generator.

The Compiled Domain Model module helps you create domain model classes based on your Sitecore templates and is capable of validating the model with Sitecore data at any given moment.

Send a message from Sitecore to a channel on Slack when users change an item, publish or install a package

A source generator that generates C# code based on Sitecore Content Serialization (SCS) .yml files.

TypeChatSharp is a library that makes it easy to build natural language interfaces using types in C#. It is a direct port from TypeChat, but is not maintained by Microsoft.