HiddenMonk

Unity3DRuntimeTransformGizmo. A runtime transform gizmo similar to unitys editor so you can translate (move, rotate, scale) objects at runtime.

Unity3DCustomCharacterControllerCapsuleCollisionDetection. A custom unity3d capsule character controller that uses its own collision detection system.

geometry3Sharp. C# library for 2D/3D geometric computation, mesh algorithms, and so on. Boost license.

giles. GILES: A Runtime Level Editor for Unity3D

LiteNetLib. Lite reliable UDP library for Mono and .NET