GNU Guile

GIMP   (Compare Project)

Mostly written in C

License: gpl3_or_later, lgpl21_or_later, lgpv3_or_later

Racket   (Compare Project)

Mostly written in Racket

License: lgpl21

CHICKEN Scheme   (Compare Project)

Mostly written in Scheme

License: BSD-3-Clause

TeXmacs   (Compare Project)

Mostly written in C++

License: gpl3

GNU Guix   (Compare Project)

Mostly written in Scheme

License: gpl3_or_later

SISC   (Compare Project)

Mostly written in Scheme

License: gpl, mozilla_public_1_1

Freetalk   (Compare Project)

License: Unknown

Geiser   (Compare Project)

License: bsd

Gnotime   (Compare Project)

License: gpl

uim   (Compare Project)

Mostly written in Scheme

License: BSD-3-Clause