Some of you may remember
Spidermod from a while back. Pretty much from the beginning, people have been requesting that this mod should have Spiderman's famous wallclimbing ability.
Spidermod 1.3 Alpha has been updated with a new wallclimbing feature, thanks to some clever Lua coding from its creator,
ancientevil.
To make yourself "grab" on to a wall, simply walk up to the wall and press your use key (typically
E) and you should be able to start scaling large buildings no problem. Please note that strafing doesn't seem to work while climbing walls, so you're pretty much stuck using forward and backward keys.
Check it out here:
http://www.garrysmod.org/img/?t=dll&id=67604
And if you need more information or support, check out the
forum thread.[...]