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General-purpose modern functional library for R5RS
prelude.scm is a fully R5RS-compliant library, implemented purely in Scheme, that adds some useful procedures and idioms like: pattern-matching, for comprehension, and so on.
An R5RS Scheme interpreter and library written in Haskell. Provides advanced features including continuations, hygienic macros, and the full numeric tower.
The Scheme Natural Language Toolkit (S-NLTK) is a Scheme R6RS library for language and text processing, and various tasks related to symbolic and statistical analysis of language data.