The name Osada was revived another time for an experimental development version with the same features as Zap otherwise.
Redmatrix 2020 was the same as Osada, but with ActivityPub off by default while it was on by default on Osada and Zap. It is not clear whether it came to exist by abandoning the old Red Matrix from 2012 and using the name for an Osada fork or by merging Osada code into the old Red Matrix.
Finally, the name Mistpark was revived, too. Mistpark 2020, also known as Misty, was intended as a testing version between rock-solid Zap and bleeding-edge Osada. This way, new features and improvements could be rolled out to daily-driver instances and tested by a larger audience with a much reduced risk of things breaking. Its target audience was admins and users for whom Zap was too conservative.