Unity - The multiplatform game creation tools for everyone.
MotionDen - Free online animated video maker
Godot Engine - Feature-packed 2D and 3D open source game engine.
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!
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Rocketium - A DIY video creation platform. Make videos in minutes using preset themes and templates.