Unity - The multiplatform game creation tools for everyone.
Kongregate - Kongregate has free games that you can play online. Choose from thousands of free flash games.
Unreal Engine - Unreal Engine 4 is a suite of integrated tools for game developers to design and build games, simulations, and visualizations.
Newgrounds - A community of artists, game developers, musicians, voice actors and writers who create and share some of the best stuff on the web!
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Friv - A safe place to play the very best free games!