I’ve been using redmine for a decade for creating a project task breakdown, tracking time on tasks and projects and using that data to invoice customers, as well as issue tracking.
The interface works, I don’t mind it. It allows export of data easily, and pdf generation.
I wish redmine’s website for showing users what plugins exist and are up to date was a bit better. Plug-ins always seem to fall in to disrepair, and can make upgrades difficult.
I am running it through docker on my synology nas.