OpenConf: peer-review management system (conferences, workshops, journals, etc)
http://www.openconf.com/ 2010-12

Subversion: version control
http://svncorp.org/ 2010-12

CruiseControl: continuous integration server
http://cruisecontrol.sourceforge.net/ 2010-12

Trac: wiki and issue tracking system for software development projects
http://trac.edgewall.org/ 2010-12

Selenium: is a suite of tools specifically for testing web applications (firefox plugin)
http://seleniumhq.org/ 2010-12