cover more open source applications

Some ideas from tabs I had open:

• Skia
• WebRender
• Minetest (!26 (closed))
• Xonotic (!21 (merged))
• FlightGear
• Oolite
• Pioneer Space Sim (!28 (merged))
• Rigs of Rods
• Speed Dreams
• Godot Engine demos (large number of MIT-licensed demos available with easy UI to run them)
• Blender editor modes
• Blender rendering
• Neverball (uses point sprites!)
• Torque3D engine demos
• OpenRA
• gfx-rs demos (uses compute shader!)
• Amethyst engine demos
• LOVE demos
• Stellarium
• Warzone2100 (uses texture compression, vc4 had issues)
• filament (looks like some pretty scenes)
• The Dark Mod (!29 (merged))