Gwen Weinholt

CapyScheme, R7RS/R6RS Scheme implementation in Rust (unofficial image)

R6RS Scheme interpreter (unofficial image)

Sagittarius Scheme, R6RS/R7RS Scheme system (unofficial image)

Racket configured for R6RS Scheme (unofficial image)

Mosh Scheme (unofficial image)

Loko Scheme, optimizing R6RS compiler

Larceny Scheme configured for R6RS Scheme (unofficial image)

Iron Scheme, R6RS Scheme on .NET (unofficial image)

R6RS Scheme compiler (unofficial image)

GNU Guile configured for R6RS Scheme (unofficial image)

Gerbil Scheme (but their own image is: gerbil/scheme)

Gauche Scheme

Cyclone Scheme-to-C Compiler (unofficial image)

Chibi Scheme, R7RS implementation (unofficial image)

Reliable, high performance R6RS Scheme compiler (unofficial image)

Vicare Scheme, R6RS Scheme compiler (unofficial image)