FutureLearn - Free online courses from top universities and cultural institutions
Unity - The multiplatform game creation tools for everyone.
StraighterLine - StraighterLine is an online educational platform that provides a huge amount of courses on various topics fully enriched with knowledge.
Godot Engine - Feature-packed 2D and 3D open source game engine.
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Blender - Blender is the open source, cross platform suite of tools for 3D creation.