Godot Engine - Feature-packed 2D and 3D open source game engine.
Doodly - Create your own doodle video in just 60 seconds
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
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!
BYOND - BYOND is the premier community for making and playing online multiplayer games.
Prezi - Welcome to Prezi, the presentation software that uses motion, zoom, and spatial relationships to bring your ideas to life and make you a great presenter.