So I'm waaay out of touch with the whole emulation scene. I'm just coming back to it after not touching it since the late 2000's

I've been messing around with Dolphin, Yuzu, RCSP3 mainly, but seen screenshots of a few others.

Relevant information: I'm a Windows user, and I'm using the stand alone emulators.

I've noticed that they all have the same, or very similar user interfaces. I'm all for standardization, but I'm curious if this is coincidence, or is there a specific front-end system that they're all using?