I tried this out: Lost Coast was nice, but short. I didn't care much for the DM.
hehe, I had already "acquired" them, but seeing as how this is permanent I decided to get in on the fun.
Just so everyone is clear, any source game, HL2
M and HL2:LC both being source games, give you access to a variety of mods.
Sourceforts is the best mod out IMO.
Dystopia is another mod, as well as gmod, 9 is free, and 10 they charge for.