An online retro board, that everyone can log into.
Start up a video call on Google Meet, Zoom, Skype, or whatever tool you already use, and open RemoteRetro in your browser. Throw it up on a tv/screen/projector, and have the remote team members join in and everyone is guided by a facilitator. Or, if your team doesn't have any remote team members, use it to like a scribe to keep a record of the sprint/iteration's retro items.
In building RemoteRetro, we used it to run retrospectives on the progress of the development of it. We've built the tool to scratch our itch, to solve our problem. We hope to help other teams also run excellent agile retrospectives, where every team member feels heard and included.
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Reetro.io - Reetro is a versatile retrospective tool for agile teams, collaborate with your team and get better in what you do with a simple, intuitive and beautiful tool