A very simple OOP system

Implementation of the XDG Base Directory Specification

named standard colors as available in X11

Wadler/Leijen-style pretty-printing combinator library

An implementation of vlists, a functional list-like data structure.

Port of the SRFI-43 reference implementation

A template for defining dynamic arguments procedure

Unicode support shim

URI generic syntax (RFC 3986) parsing and manipulation.

Parser for common URI schemes

Conversion of units of measurement

Typed variants of various record-definition macros

A trie (prefix tree) implementation

Transducers for working with foldable data types.

tracing and breakpoints

HMAC-Based and Time-Based One-Time Password algorithms as defined in RFC4226 and RFC6238

A Scheme/TclTk GUI build tool

Resource w/ Timeout

Tiger/192 Message Digest

Thread Utilities

Python's "this" module ported to CHICKEN

Test Utilities (for test egg)

A tool to test new eggs before they are added to the official CHICKEN repository

Yet Another Testing Utility

Simple networked REPL over TCP

Synchronization Forms

Symbol Utilities

The sxpath bits of sxml-tools from the SSAX project at Sourceforge

The SXML transformations (to XML, SXML, and HTML) from the SSAX project at Sourceforge

Serialize SXML to XML and HTML

A program to convert svnwiki syntax to HTML

Parse svnwiki to sxml

A wrapper around Subversion's libsvn_client C library.

String Utilities

Statistics library

An aggressively optimizing Scheme->C compiler

Provides LIFO queue (stack) operations

Oleg Kiselyov's XML parser

SRFI-99 record types

SRFI-78: Lightweight testing

SRFI-69/90 hash-table library (w/ weak references)

SRFI-69 hash-table library

Homogeneous and heterogeneous arrays

SRFI-5: A compatible let form with signatures and rest arguments

SRFI-48: Intermediate Format Strings

SRFI-42 (Eager comprehensions)

SRFI 41 (Streams)

SRFI 38: External representation for data with shared structure

A simple and flexible command-line option parsing facility

SRFI-35 Conditions

SRFI-34: Exception Handling for Programs

Localization

Supplemental Numerics (includes complex hyperbolic functions)

Random port libraries

Sources of Random Bits

Tagged procedures with type safety (with SRFI-229 compatability)

SRFI 253: Data (Type-)Checking

SRFI 233: INI files

SRFI 232: Flexible curried procedures

SRFI 209: Enums and enum sets

SRFI-207: String-notated bytevectors

SRFI-197: Pipeline Operators

SRFI-196: Range Objects

Time Data Types and Procedures

SRFI 189: Maybe and Either

A JSON parser and printer that supports JSON bigger than memory.

SRFI-18 thread library

SRFI-179: Nonempty Intervals and Generalized Arrays (Updated)

SRFI 178: Bitvector library

SRFI-162: Comparators sublibrary

SRFI 160: Homogeneous numeric vector libraries

SRFI 158: Generators and Accumulators

String library (reduced)

SRFI 151: Bitwise Operations

SRFI 144: Flonums

SRFI 143: Fixnums

SRFI 141: Integer division

SRFI-14 character-sets library

SRFI-137: Minimal Unique Types

SRFI 134: Immutable deques

SRFI-133: Vector Library (R7RS-compatible)

SRFI-132: Sort Libraries

SRFI-13 string library

SRFI-128: Comparators (reduced)

SRFI-127: Lazy Sequences

SRFI-117: Mutable Queues

SRFI-116: Immutable Lists.

SRFI 115: Scheme Regular Expressions

SRFI-113: Sets and Bags

SRFI-1 list library

A convenience extension for representing SQL NULL values

Easy access to variables from HTTP requests

Procedures for managing cookies

A small but powerful web server

Arbitrarily large vectors

Lists of symbols as sets

Weight-balanced trees

CHICKEN SLIB compatibility library

The SLIB character plotting library