Update: Just a couple of notes... firstly, if you're having trouble extracting the zip files under Linux, try using UnZip, or maybe LinZip.
Secondly, the map "marines.bsp" will not work on Linux servers (it'll crash them). You might be safest to delete it from the maps\ dir.
Woohoo... The Linux port is now available HERE! Note: you only need this if you intend to run a SvenCo-op server under Linux. SvenCo-op v1.3 must be installed before installing this update. It was made by Alfred, creator of the Half-Life Admin Mod (many thanks!). There is one catch, though...
Because the HL Linux server software doesn't include some necessary files (such as monster models, etc.), you'll need a copy of the pak0.pak file from a full installation of the Windows version of Half-Life (sorry, no legal way to avoid this :/. Hope you have a HL CD around).
After installing SvenCo-op v1.3 and the Linux server update, copy the pak0.pak file from the (Windows) Half-Life\Valve\ directory to the SvenCoop\ directory inside the Linux HL directory. Everything should work after that. If you have any problems, tell me.
BTW, we're in rather desperate need of good SvenCo-op servers at the moment. If you know of anyone who might be interested in setting one up, could you suggest it to them, thanks?
Also, if you set up a permanent SvenCo-op server, E-mail me with the IP address, and I'll post it here to get you some traffic.
On another subject, maps 4 and 5 of the popular Operation Retribution series are available from the Files page. I hear that they're even better than the first maps, with more diverse locations.
Also, most of the files on the Files page now have a link to an alternative download location beside them, for those who have trouble downloading from PHL (like me :).