• http://retrospectiva.org/ (ruby) no kaban
• http://kompiro.org/jamcircle/en/
• http://planningpoker.com/ (realtime team estimation)
• http://www.atlassian.com/software/greenhopper/tour/scrum.jsp?gclid=CIyy_oKj9agCFcsZQgoduH-aTg (from the confluence people)
• http://www.icescrum.org/ (groovy)
• http://www.scrumpytool.com/ (meh?)
• http://code.google.com/p/planigle/ (ror)
• http://scrumdo.org/ (hosting available)
• http://agileexpress.sourceforge.net/ (java)
• http://scrumdo.org/ (python/django/pinax)

• http://www.simple-kanban.com/ (javascript, might be a useful component)
• http://xpstudio.sourceforge.net/ eclipse plugins

• http://scrumdashboard.codeplex.com/ (c#)
• http://scrumtime.org/ (asp.net)

hosted-only services

• http://www.bananascrum.com/
• http://pangoscrum.com/
• http://www.agile42.com/cms/pages/agilo/