http://trac.edgewall.org/
http://trac.edgewall.org/wiki/TracFeatures

http://www.redmine.org/
http://www.redmine.org/wiki/redmine/Features

Roundup; basis systeem; issue-tracking-BUILDER
http://roundup.sourceforge.net/

comparison of issue-tracking software:
http://en.wikipedia.org/wiki/Comparison_of_issue_tracking_systems

TRAC:
lijkt meer gericht op software versie beheer, betere wiki, betere SVN integratie ?
color-coded tickets
keywords (tags)
gantt charts en time-tracking dmv plugins.
doxygen plugin

Redmine:
heeft support voor multiple projects, gantt charts, calendar, time-tracking.
Kan ook CVS gebruiken !