Trac
Used by 5 peopletrac.edgewall.org ↗
“For tracking tasks and other work items, the Fedora Design team uses trac and it's been very useful.”
Máirín Duffy Interview, UI designer, usability tester (Red Hat, Fedora) · via Uses This 
“We use Trac for ticketing internally, but I keep API-related tickets public on Google Code.”
Alex Payne Interview, API developer (Twitter) · via Uses This
