As I have been powering along with my Unity creation for Cartographer, I like coming across people doing cool things with other 3D engines, esp the CryEngine.
Here is a clever little mod bringing the time travelling coolness of a Delorean to the CryEngine world. This Back to the Future mod has some very nicely realised pieces:
There are a few vids for The Other Side which uses the engine to create a 3D side-scrolling jumper-shooter game. This demo shows off the logic and has plenty of polish - I like the way the map zips around as the direction of movement changes.
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