That's right, Odamex now has rudamentary single player support! You can start the odamex client with the standard -warp xx parameter (where xx is the map number) and it will load the map in single player mode. This should help a lot for map and engine testing as it eliminates the "netcode" factor. So, if you've been wanting to help out but are afraid of "netcode", now it's even easier!
Note that this only works with Doom II right now.