Entitas is a super fast Entity Component System (ECS) Framework specifically made for C# and Unity
An efficient voxel framework for Unity3d
Discussion of UtinyRipper tool
Various Unity3D components for 2D games. WIP
An extension for Unity3d to place AdMob banners in your Android games.
C# REPL tool for Unity3D built on Miguel's tool.
Image filter for Unity3D (Pro-only) to help preview what your game will look like to people suffering from color blindness.