VideoLan - VLC: Official site - Free multimedia solutions for all OS!
Spine - Spine is 2D animation software designed specifically for software and game development.
Renderforest Video - Free animation and intro maker, slideshow and video creator
Synfig Studio - Just another WordPress site
BombBomb - BombBomb allows companies to easily record and send video email from Gmail, mobile, or web.
DragonBones - DragonBones is an open source project for 2D skeletal animation.