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Re:Frab – free and open conference management system by ziari on Thursday October 31, 2019 @09:26PM (#21415512)
I found some in the GitHub wiki (last edited in 2013, though).

https://github.com/frab/frab/wiki/Screenshots

Re:Frab – free and open conference management system by tylermenezes on Thursday October 31, 2019 @09:34PM (#21415552)
Look mostly accurate from my last experience with frab in 2018!