I'm currently hosting a test build of SMMP, if anyone is willing to give it a shot. Keep in mind, bugs are to be expected. This build has an assload of major changes since the previous builds.
The server isn't publicly listed, so you must add it to your list on Doomseeker or Doom Explorer. The IP of the testing server is shadowmavericks.com:10669
GetWad/Wadseeker will automatically download the necessary files. Note, they are huge due to being uncompressed. This is to avoid loading pauses and because it makes compiling devbuilds quicker.
The build gets updated frequently, so if you join and there's a version mismatch, delete your existing copies of SMMP_Core_DEV.pk3 and SMMP_MapsAndExtras_DEV.pk3, and then re-download them.
This requires Zandronum 3.0.
