Unity - The multiplatform game creation tools for everyone.
Drawasaurus - Drawasaurus is an online drawing & guessing game you can play with friends or strangers.
Godot Engine - Feature-packed 2D and 3D open source game engine.
skribbl - Word guessing based on drawing.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
gartic.io - Draw, guess, and win!