These is similar questions which seems a bit outdated:
- http://stackoverflow.com/questions/36415/best-chat-im-tool-for-developers - 2008 year
- http://stackoverflow.com/questions/1505848/good-im-chat-solution-for-pasting-code - 2009 year
Today we use CommFort which can be used for group, user chatting and have ability for share images and show it's preview in chat window, that's all features we use.
We looking for modern something.. maybe separate client or browser based solution that:
- Allow share screenshot (drag and drop) with instant preview on other side ( maybe also capture it )
- Paste code snippetts
- Notify about new bug from bug tracker (Redmine)
- Notify about new commit from repository (VisualSVN)
- Store room chat history on server and retrieve it on connect like in Jabber
- Google Wave
Today it's opensourced and can be installed on own server
- Jabber server + some client
- IRC server + some client
- Anything else ?