Baby Audio Crystalline (Seriously fun)
Baby Audio has only been around for a relatively short period of time but has made a big impact thanks to a set of plugins that focuses on what the user wants, rather than blinding you with specs, data sheets and direct emulations of rusty old hardware.
With plugins like Spaced Out, it takes the concepts behind that hardware (in that case a Space Echo) and transfers them to the 21st century, putting the controls you want in front of you, and leaving much of the science to the white coat brigade.
More info:
https://babyaud.io/crystalline