Wekan is really a copy of Trello, it's awesome. Installing it through Sandstorm.io makes it very easy, but I don't have production experience with Sandstorm.io.
I'm a big fan of Clubhouse, and looks like someone wrote a tool to do exactly what you want: https://clubhouse.io/developers
https://taiga.io/ look pretty good the last time I did a research for this question.
Taiga is alright, but I can't say I fell in love with it either. Then again, I didn't like Trello any better. Still ended up just using plain text files or spreadsheets.
I've been using the Github Project board functionality which looks a lot like Trello. I doubt there's an integration where you'd be able to port one to the other though.
Try Active Collab for this feature. I started using it for our company, few months ago, and never really looked back.
Zenhub is pretty close I guess.
We've been using Meistertask and have liked it a lot so far.