Can this be a free Jira? (tuleap.org)

Interesting, thanks for sharing. Have you tried this out at all?

When not using JIRA I generally utilize Clubhouse.io (https://clubhouse.io) or Pivotal Tracker.

I've also checked out Taiga.io (https://taiga.io/) briefly, however, I've never utilized it for a project.

Thanks!

Looks like the demo is using an invalid https certificate. https://demo.tuleap.org/account/login.php