VideoLan - VLC: Official site - Free multimedia solutions for all OS!
Unity - The multiplatform game creation tools for everyone.
Renderforest Video - Free animation and intro maker, slideshow and video creator
Godot Engine - Feature-packed 2D and 3D open source game engine.
BombBomb - BombBomb allows companies to easily record and send video email from Gmail, mobile, or web.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.