Hello,
I did a reverse engineering of the commander keen source (keen 5), added in the doom networking code and ended up with a 2-4 player arena stunmatch keen game. I figured people here might be interested. You need DosBox (preferably 0.74) to play as it uses IPX networking for multiplayer (emulated by DosBox).
Download links and instructions on how to get it working are here: http://www.pckf.com/viewtopic.php?t=1856
vid: http://www.youtube.com/watch?v=bJcFV7jKj5k
Enjoy!
Multiplayer Keen Remake
Oooh that's exciting... a multiplayer browser game is what Keen has been missing! It was the first game I played, and the nostalgia still gets me!