GT8 is a game I was working on, but which has been on stand-by for a while. Not much in terms of gameplay, and the collisions suck. You can walk or drive around (some cars are faster than others). The map is still very incomplete. Everything is in a very experimental phase.
I may eventually get back to it.
WASD / ARROWS to move
SPACE to jump (or toggles on/off the siren lights on the ambulance or cop car, while you're driving it (no sounds))
ENTER to get in/out of cars