This is a
#GNUsocial instance. It's got some bugs, but it looks like the platform is no longer being actively developed. It does not support Activity Pub, which will cause it to gradually de-federate as new services use the newer protocol. All the other GS instances are shutting down or moving to pleroma. I recruited a large handful of users to join this instance, but they didn't like the the UI and all but one wandered off. The pleroma interface is more desirable.
It's now officially on my to-do list to migrate. I'd hoped for a tool to migrate databases, but I don't think one was ever built (and I do want to learn dB programming, but I've got a few other projects right now.)