Gambit is an efficient implementation of the Scheme programming language.

Official chibi-scheme repository

lightweight scheme interpreter

A small nanopass compiler from a subset of Scheme to C. (Developed for Clojure Conj 2013)

A Scheme to x86-64 compiler in Scheme

A manual (beh...) clone from bitbucket to use hosted CI service which only support GitHub

An assorted collection of Scheme utilities. Implements native monads, pattern matching, generic operator dispatch, serialization, event handling, memoization, suffix trees, among other things. It s…

This package implements genereric syntax for working with monads in R6RS scheme.

minimalist polymorphic scheme-(co)monads, written to avoid use of any advanced language features except hygienic macros

Framework for defining and using monads in Chez Scheme

various monads in r6rs scheme

Intermediate Format Strings

I needed "monads" in scheme