Topological sorting is an algorithm that takes a graph consisting of nodes and other nodes that depend on them, forming a partial order, and returns a list representing a total ordering of the graph. If the graph is cyclic, the topological sort will fail. The procedure topological-sort returns three values. If sorting succeeds, the first value contains the result and the second and third are #false. If sorting fails, the result is #false and the second and third value may provide additional information about the error.

Guile-redis provides a Scheme interface to the Redis key-value cache and store.

Kracht provides helpful and convenient functionalities that can help you develop more comfortably in your Guile Scheme project. You can see it as a batteries-included addition to the (already great) standard library, complementing it, and helping developers write cleaner code.

guile-email is a collection of email utilities implemented in pure guile. It supports parsing MIME (Multipurpose Internet Mail Extensions) compliant email messages and reading emails from the mbox format.

guile-aspell is a Guile Scheme library for comparing a string against a dictionary and suggesting spelling corrections.

This package provides SRFI-145. This provides the means to denote the invalidity of certain code paths in a Scheme program.

guile-sundown is a library that renders Markdown as HTML. It supports many Markdown extensions including tables.

Guile-DSV is a GNU Guile module for working with the delimiter-separated values (DSV) data format. Guile-DSV supports the Unix-style DSV format and RFC 4180 style format. Also Guile-DSV includes a console program named dsv that allows to view and process DSV data, including such operations as delimiter change, conversion from one DSV standard to another and printing the data as pseudographics tables.

This package provides purely functional data structures written in R6RS Scheme and compiled for Guile. It has been tested with Racket, Guile 2, Vicare Scheme and IronScheme. Right now it contains:

• queues

• deques

• bbtrees

• sets

• dlists

• priority search queues (PSQs)

• finger trees

• sequences

• heaps

• hash array mapped tries (HAMTs).

This Guile library provides tools for reading, comparing, and writing Semantic Versions. It also includes ranges in the style of the Node Package Manager (NPM).

This package provides purely functional data structures written in R6RS Scheme and compiled for Guile. It has been tested with Racket, Guile 2, Vicare Scheme and IronScheme. Right now it contains:

• queues

• deques

• bbtrees

• sets

• dlists

• priority search queues (PSQs)

• finger trees

• sequences

• heaps

• hash array mapped tries (HAMTs).

Lokke intends to provide a full dialect of Clojure for Guile. It also consists of a set of Guile modules providing some of Clojure's functionality in two different guises.

Guile Netlink is a GNU Guile library providing an implementation of the netlink protocol.

It provides a generic library for writing implementations of a netlink protocol, a low-level rtnetlink implementation that uses that library and a high-level API for network management that uses rtnetlink.

This package provides an implementation of SRFI-232, which describes curried, a variant of lambda that creates true curried procedures which also behave just like ordinary Scheme procedures. They can be applied to their arguments one by one, all at once, or anywhere in between, without any novel syntax. curried also supports nullary and variadic procedures, and procedures created with it have predictable behavior when applied to surplus arguments.

f.scm is a library intended to facilitate working with files and directories (the file system in general). It was initially inspired by the f library for Emacs.

squee is a Guile library for connecting to PostgreSQL databases using Guile's foreign function interface.

guile-sjson is a json reader/writer for Guile. It has a nice, simple s-expression based syntax.

This library implements a JavaScript Object Notation (JSON) parser and printer. It also supports parsing JSON objects that may be bigger than memory with a streaming API.

Hygguile is a library that allows you to create cozy web user-interfaces using Guile Scheme, by defining an expressive DSL, and by leveraging the power of S-expressions, SXML and OliveCSS.

The project aims to provide reusable, professional-looking and accessible web components, whose names resemble the HTML counterparts, thus easing the learning curve, and reducing the cognitive load.

Fibers is a Guile library that implements a a lightweight concurrency facility, inspired by systems like Concurrent ML, Go, and Erlang. A fiber is like a "goroutine" from the Go language: a lightweight thread-like abstraction. Systems built with Fibers can scale up to millions of concurrent fibers, tens of thousands of concurrent socket connections, and many parallel cores. The Fibers library also provides Concurrent ML-like channels for communication between fibers.

Note that Fibers makes use of some Guile 2.1/2.2-specific features and is not available for Guile 2.0.

Guile Documentá is a command-line program and accompanying library to generate API documentation for GNU Guile projects.

This package provides a Guile Scheme wrapper for libgsl.so. Implements

• GSL vectors.

• Matrices.

• BLAS operations.

• Eigensystem solutions.

• One-dimensional root solvers.

guile-tap is a library for GNU Guile that implements a framework for specifying test cases that emit output that adheres to the Test Anything Protocol (TAP). It comes with an experimental harness (tap-harness).

Veritas is a testing framework for Guile with an EDSL to define test suites. Emphasis is placed on legibility and maintainability of tests. Veritas shuffles tests and runs them concurrently by default to ensure robust testing practices.