csDoom 0.4 beta has been released! Based off the ZDoom sources, according to the homepage, csDoom brings open-ended internet play to Doom. There are currently Win32, Linux, and FreeBSD versions available for download, and while the source code for the client isn't released yet due to the possibility of hax0ring, you can download the server source code for Linux/FreeBSD as well. If you want to try it out I have a server running at 22.214.171.124... too bad I can't join as doomcl.exe crashes on me. Oh well.