The user interface appealed to our developers, which should not be underestimated in power. After exhausting them with different options and trying multiple other services, no other service was easy enough for them to use and the thought of using one of the others became a pain for them. I don't let my team drive the choices, but I picked my battles. We needed to use something, so I might as well find something they liked. The integrations with other services like Slack and GitLab made it easy to add task management to our workflow. Allowing the devs to tag their git commits with a message to update/close a task made it even better.

Open source Very good user interface Easy to manage software development process

It's Open Source, It has terrific compatibility with Kanban and SCRUM methodology, it let keep your team inform and updated all the time, with the webhooks you can integrate it with so many others tools and you don't need a monster of VPS to run it (besides others PM tools)