Meshed Co-op (the operational arm of NZ Open Source Society) is using
http://www.redmine.org/guide
I find the way the PaaS creates dependencies amongst subtasks, watching
specific forum topics, and ability to xref both within the wiki to be
useful in documenting DevOps. Haven't used the GANTT fe
Github offers basic issue management that integrates well with your git
repos and pull requests.
A github wiki is simply text files using github-flavored markdown and lives
in a branch of a git repository.
It's easy to work with it locally using your ruby/node.js/whatever tools.
You can push cha