Is quite possibly the BEST THING EVER. I <3 playing with it. Idk what the hell I'm doing half the time, but it's fun as hell to make rocket cars.
Garry's Mod is a mod on the Half-Life 2 shooter (awesome game if you haven't played it yet you should find a way to) basically making the game a sandbox. It gives you freedom to place/create anything within the game and allows you to fool with it to make cool things. There was a thread on this before but it probably got deleted in the wipe. Any way you should goggle it and look at some of the stuff people have made, some of them are really cool. EDIT: http://www.starcraft2forum.org/forums/showthread.php?t=2231&highlight=garry's is the link to the other thread, it's not really about it and it's long dead i just figured I'd post it. Also I have no idea why Garry's is red it was just automatic.
That looks like a lot of fun, to bad that I don't own Half-Life two, I only have CSS. Can you show us some of the stuff you made?
Ha ha, I don't know what I'm doing really. Basically, I give things wheels, and rockets. That's about it. I made a really cool thing once though, though you'd have to play HL2 to get it. I took a Combine train, gave it some rockets, and welded an Overwatch watchpost on top. It was epic cool.
I like that mod... it's just that A) I cannot buy version 10 and B) my computer doesnt like the pressure I create by playing it with more than 2 objects.