GoAnimate - Make your own animation quickly and economically with GoAnimate. Reach prospects and customers with animated videos online about your business and products.
Grit Game Engine - The Grit Game Engine is an MIT-Licensed Open Source Game Engine that is highly scriptable via Lua.
Animaker - Animaker is an online do-it-yourself (#DIY) animation video maker that brings studio quality presentations within everyone's reach. Animated Videos, Done Right!
Lumix Engine - Open source 3D game designer and engine written in C++.
HandBrake - HandBrake allows users to easily convert video files into a wide variety of different formats.
MOS - Lightweight game engine.