Scrumlr is an online collaboration tool that helps teams reach new heights. Start your first retrospective or collaborative session in an instant - no registration required and completely free and open source.
Sure, RetroTool is awesome.
But what about these open source self-hostable alternatives?
You may want to check by yourself: Scrumlr.
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Scrumlr
Webapp for collaborative online retrospectives
★ 269 retrospective Agile Scrum License: MIT