Unity - The multiplatform game creation tools for everyone.
PICO-8 - Lua-based fantasy console for making and playing tiny, computer games and programs.
Godot Engine - Feature-packed 2D and 3D open source game engine.
TIC-80 - TIC-80 is a fantasy computer where you can make, play and share tiny games.
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
Pyxel - Retro game engine for Python inspired by fantasy consoles.