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The Startup Way - The new book from Eric Ries, author of The Lean Startup
Unity - The multiplatform game creation tools for everyone.
UI Playbook - The documented collection of UI components
Godot Engine - Feature-packed 2D and 3D open source game engine.
50 UI Tips - Improve your UI/UX skills in an hour, for free
Blender - Blender is the open source, cross platform suite of tools for 3D creation.