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If you don't care about the small footprint then go with Gambit/Bigloo as they play nicely with C too.

If you don't care about Gambit's C integration, go with Racket, it's very beginner friendly and has lots of libraries.

Or:

If you don't care for Rackets IDE, go with Guile, it's the official GNU extension language.

TL;DR find a Scheme implementation that is good at what you need and use it.

Apart from Racket, Chicken Scheme is the most active Scheme and it has a lot of libraries (eggs as they call it) from OS interface to amazon web services and web frameworks.

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