Tig is a git repository browser that additionally can act as a pager for output from various git commands.

Bazaar Explorer is a desktop application for using the Bazaar Version Control System. It provides a high level interface to all commonly used features, launching "applets" from the QBzr plug-in to provide most of the functionality. Alternatively, the applets from the bzr-gtk plug-in can be used if it is installed. Bazaar Explorer runs on GNOME, KDE, Windows and Mac OS X. It requires Bazaar 1.14 or later and QBzr 0.11 or later.

Fossil: Simple, high-reliability, distributed software configuration management ... with bug/issue tracker, wiki, web interface etc.

Openfire is a real time collaboration (RTC) server licensed under the Open Source GPL. It uses the only widely adopted open protocol for instant messaging, XMPP (also called Jabber). Openfire is incredibly easy to setup and administer, but offers rock-solid security and performance.

KARL is an open source web system for collaboration, organizational intranets, and knowledge management.

Cross Platform WebKit Browser

the screenshot tool formerly known as GScrot; good rename IMHO

I tool similar to monit (comparison anyone?): supervise and check running processes.