After years of using Jira I kinda miss Trac.
It's sad to me that they lost momentum. I think they got stuck trying to overcome tech debt and bug fixes and feature requests started to pile up.
From time to time I keep an eye on CommonMark implementations and fantasize about writing an MVP to replicate parts of Trac by composing existing tools. Unfortunately there are like 5 other things I'd rather do with my free time.