Redmine:
- https://www.redmine.org/projects/redmine/repository/svn/show...
- https://www.redmine.org/projects/redmine/wiki/Download
RequestTracker:
- https://github.com/bestpractical/rt
- https://github.com/bestpractical/rt/releases
A bit like Phabricator, these are almost frameworks that can do a ticketing UI.
// But really, probably something mentioned elsewhere in the thread, Taiga:
- https://community.taiga.io/t/taiga-30min-setup/170