GoAnimate - Make your own animation quickly and economically with GoAnimate. Reach prospects and customers with animated videos online about your business and products.
Spine - Spine is 2D animation software designed specifically for software and game development.
HandBrake - HandBrake allows users to easily convert video files into a wide variety of different formats.
Synfig Studio - Just another WordPress site
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!
DragonBones - DragonBones is an open source project for 2D skeletal animation.