Because SAS3 is a multiplayer game with private matches, there must be a way to communicate with your team and arrange a private match. There are five known chats for SAS3.
Here are the main five :
1. http://xat.com/SASZombieAssault3Group This is a General chat, but almost all of it's members are dedicated SAS3 players, with many elite players as well. SAS3 discussions are very frequent as well. It is the most active on this list.
2. http://xat.com/rgmandratpm RGM's chat room. It is a dead chat.
3. http://xat.com/SASBloonsTrolling A chat started by ultrarotom (~desu), it is a very inactive chat.
4. http://xat.com/ZA3PrivateMatch A chat started by JakeColeman97, it is a dead chat.
5. http://www.mochigames.com/chat/popup/ A chat hosted by mochigames.