Vox-L is one of the games I'm producing. It's what would happen if Gary's Mod and Minecraft had a secret love-child. You can find the project site here: vox-l.com.
It's somewhere between a game and a game engine, so I'm calling it an "engine game".
It started as an emulator for Minecraft modding in LearnToMod -- one of my other projects. Since then, I've added some support for physics, custom assets, and an event-driven modding API.
Physics video demo:
I'm the lead coder on this project. But I'll be switching into a product manager role with it shortly. You can expect to see Vox-L on Kickstarter this year.