Tons of aim, awp, cs, de, fy, plus many more misc. gametype maps (about 3 gigs worth, including bot nav files). I'll have to compile a full maplist, hopefully with screenshots, later (I'm not sure which maps I have gotten from servers or came with CS).

Edit: Here's the forum topics about the mappacks (they are the pinned threads for each pack, but right under the pinned threads should be one about somebody making a pack that includes all the other packs in one installer [I posted on the second page in the "all mappacks in one installer" thread linking a 3 part version instead of the 12(?) parts the OP posted]). Too many to list and only some had screenshots. If you want to use any of them on the server, I would recommend "installing" the maps to a totally different directory than the CSS maps folder and FTP the ones you want into the server (you may have to also install them to your <path to game directory>\cstrike\maps folder [the default install location] in order to test the maps to see which ones you want).