Warzone 2100 - Join "The Project" to restore humanity's synaptic-link technology after nuclear war...
Unity - The multiplatform game creation tools for everyone.
Zero-K - Do you want epic battles?
Godot Engine - Feature-packed 2D and 3D open source game engine.
OpenRA - What if Albert Einstein changed history? What if the Andromeda Strain were a miracle mineral?
Blender - Blender is the open source, cross platform suite of tools for 3D creation.