I'm surprised nobody mention Taiga - https://taiga.io/ https://taiga.io/. It was a great contender when we compared it with Trello a couple of years ago and it'

I'm surprised nobody mention Taiga - https://taiga.io/ https://taiga.io/. It was a great contender when we compared it with Trello a couple of years ago and it's also a FreeSoftware - https://github.com/taigaio/taiga https://github.com/taigaio/taiga.