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Terasology - open source voxel world

Esoterica Engine

A game engine made as part of the Kohi Game Engine series on YouTube (and Twitch!), where we make a game engine from the ground up using C and Vulkan.

(RPG maker) Create RPG-style or similar games more simply with Flame.

Open-source, cross-platform 2D/3D/multiplayer game engine designed for everyone.

Desktop/Android/HTML5/iOS Java game development framework