I like Racket, but it is also a kitchen sink Scheme. It has a ton of features: GUI framework, drawing (although it's slow), event spaces, places, futures, OOP,

I like Racket, but it is also a kitchen sink Scheme. It has a ton of features: GUI framework, drawing (although it's slow), event spaces, places, futures, OOP, mixins, traits, macros, #langs, etc. It can get quite complex very quickly. I have mainly used it as a Scheme.