High Quality Content by WIKIPEDIA articles! ChitChat was an open source instant messaging client for Mac OS X supporting the Yahoo! Messenger protocol. It enabled users to chat with each other over the global Yahoo! chat system. The last version, ChitChat 1.2, had a more refined user interface, speed improvements, Address Book support, IM reformatting, an improved events system, and numerous bug fixes. ChitChat was programmed in the REALBasic programming environment.