a list of all rooms, recently active rooms first
General discussion about Code Review -> http://codereview.stackexchange.com/
General Arqade chat room, wherein fun is mandatory, yes, ha ha, we get it, stop bringing up Weird Al Yankovic's album art.
Game development and other polite discussion. Please don't star trivial messages.
General discussion around Ask Ubuntu, Ubuntu & official Ubuntu derivatives. For other Linux distros please see: http://chat.stackexchange.com/rooms/26/unix-and-linux
Associated with Math.SE; for both general discussion & math questions alike. Just ask; don't ask to ask. Rarely if ever expressible as a ratio of integers. See below for guidelines.
General discussion for http://german.stackexchange.com. You may speak both German and English here.
General on- and off-site discussion for http://dba.stackexchange.com
Not in main chat. (Though links to cool 5e stuff should be shared there.)
Welcome back, my Master! お帰りなさいませ、ご主人様! Sit back and relax with general chat for http://anime.stackexchange.com/. We're now serving anime & manga with a side of Moé. Smiles are free and lolis are plentiful. Ask about our new maid service.
Chat room for Travel.SE http://travel.stackexchange.com