well i know gmod isnt free, but gmod 9 is, and its pretty similar.
i just got a copy of gmod 10, and its FUCKING SWEET!
I mucked around with random stuff, making catapults, cars etc.
Then i decided I wanted to make a plane.
I added thrusters so it can turn left, right, up or down, and it has thrusters on the back to move. and to top it off it has mounted guns on the wings.
Anyone else got gmod? anyone wanna share some cool techniques? some cool things made in it?