I've heard wekan mentioned a lot (open source alternative).

Here's the migration docs: https://github.com/wekan/wekan/wiki/Migrating-from-Trello

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.

https://hn.algolia.com/?query=taiga.io&sort=byPopularity&pre...

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.

www.favro.com

zenkit.com

Thanks for the mention!