SAX is an on-site chat system that has seen several incarnations on the Cemetech site since 2006, allowing users to communicate in real-time in a fashion similar to a traditional forum's shoutbox but (less notably in the intervening years since its introduction) not requiring a page reload to see new messages.
The SAX chat room is linked to other protocols by bridges, allowing you to connect to the chat in a variety of other ways beyond this web client. Consequently, you are free to use another chat client supporting one of the supported protocols if you prefer. The supported systems are: