morningstar 

Promises library for C# for management of asynchronous operations.

Object factory and dependency injection system

Basis for Unity applications

MVVM-style two way data-binding system for Unity.

A library to traverse and query the Unity scene to find particular objects, uses something similar to CSS selectors to identify game objects.

Small toolkit of generally useful C# code. Used by Real Serious Games to develop applications on Unity3D.

A metrics output system for collecting data for analytics.

Fluent API for creating state machines in C#