Garry's mod fun :)

[Exentenzed]

I suggest this site for getting your addons.

http://www.garrysmod.org/downloads/

Before i post any more links i think you should also check this out to learn how to install them: http://www.youtube.com/watch?v=33w2i...eature=related

There are alot of fun ones, like:

http://www.garrysmod.org/downloads/?a=view&id=40859

http://www.garrysmod.org/downloads/?a=view&id=127324

http://www.garrysmod.org/downloads/?a=view&id=87297

http://www.garrysmod.org/downloads/?a=view&id=59145

There there are some must have ones which are usually downloaded from SVN repositories that the programmers keep updated so you can easily get a hold of the newest version.

Anyway, here is the most important, MUST HAVE mod for gmod. It's called wiremod.
Wiremod install instructions thread.