This is a generic C++ library that can be used to rapidly align two small molecules in 3D space, with shape - and optionally color - Tanimoto scoring.

qcint is an optimized version of libcint, a C library (also with a Fortran API) to evaluate one- and two-electron integrals for Gaussian type functions.

This extension to python-pyscf provides calculations of different electromagnetic properties for molecules and crystals.

Open Babel is a chemical toolbox designed to speak the many languages of chemical data. It's a collaborative project allowing anyone to search, convert, analyze, or store data from molecular modeling, chemistry, solid-state materials, biochemistry, or related areas.

Chez Scheme is both a programming language and a high-performance implementation of that language. The language is a superset of R6RS Scheme with numerous extensions, including native threads, non-blocking I/O, local modules, and much more. Chez Scheme compiles source expressions incrementally to machine code, providing the speed of compiled code in an interactive system. The system is intended to be as reliable and efficient as possible, with reliability taking precedence over efficiency if necessary.

This package provides a portable and efficient R[4567]RS implementation of regular expressions, supporting both POSIX syntax with various (irregular) PCRE extensions, as well as SCSH's SRE syntax, with various aliases for commonly used patterns.

This package provides a superset of the popular Scheme match package by Andrew Wright, written in fully portable syntax-rules and thus preserving hygiene.

The stex package extends LaTeX with a handful of commands for including Scheme code (or pretty much any other kind of code, as long as you don't plan to use the Scheme-specific transcript support) in a document. It provides the programs scheme-prep and html-prep to convert stex documents to LaTeX and HTML, respectively, plus makefile templates, style files, and other resources. The stex system is used to typeset The Scheme Programming Language and the Chez Scheme User's Guix, among other documents.

This is the precise pre-release version of Chez Scheme from a specific Racket release. It is used to build Racket and to bootstrap the released version of Chez Scheme.

This package provides a set of MIT/GNU Scheme compatibility libraries for Chez Scheme. The main goal was to provide the functionality required to port the program Scmutils to Chez Scheme.

Chez-sockets is an extensible sockets library for Chez Scheme.

The Nanopass framework is an embedded domain-specific language for writing compilers composed of several simple passes that operate over well-defined intermediate languages. The goal of this organization is both to simplify the understanding of each pass, because it is responsible for a single task, and to simplify the addition of new passes anywhere in the compiler. Nanopass reduces the boilerplate required to create compilers, making them easier to understand and maintain.

This package provides a port of the MIT/GNU Scheme Scmutils program to Chez Scheme. The port consists of a set of libraries providing most of the functionality of the original.

ChezWEB is a system for doing Knuthian style WEB programming in Scheme.

Chez Scheme is a self-hosting compiler: building it requires ``boot files'' containing the Scheme-implemented portions compiled for the current platform. (Chez can then cross-compile bootfiles for all other supported platforms.)

This package provides boot files for the released version of Chez Scheme bootstrapped by chez-scheme-for-racket. Chez Scheme 9.5.4 or any later version can be used for bootstrapping. Guix ultimately uses the Racket package cs-bootstrap to bootstrap its initial version of Chez Scheme.

The Nanopass framework is an embedded domain-specific language for writing compilers composed of several simple passes that operate over well-defined intermediate languages. The goal of this organization is both to simplify the understanding of each pass, because it is responsible for a single task, and to simplify the addition of new passes anywhere in the compiler. Nanopass reduces the boilerplate required to create compilers, making them easier to understand and maintain.

Chez Scheme is a self-hosting compiler: building it requires ``boot files'' containing the Scheme-implemented portions compiled for the current platform. (Chez can then cross-compile boot files for all other supported platforms.)

The Racket package cs-bootstrap (part of the main Racket Git repository) implements enough of a Chez Scheme simulation to load the Chez Scheme compiler purely from source into Racket and apply the compiler to itself, thus bootstrapping Chez Scheme. Bootstrapping takes about 10 times as long as using an existing Chez Scheme, but cs-bootstrap supports Racket 7.1 and later, including the Racket BC variant.

This package provides a collection of SRFI libraries for Chez Scheme.

The stex package extends LaTeX with a handful of commands for including Scheme code (or pretty much any other kind of code, as long as you don't plan to use the Scheme-specific transcript support) in a document. It provides the programs scheme-prep and html-prep to convert stex documents to LaTeX and HTML, respectively, plus makefile templates, style files, and other resources. The stex system is used to typeset The Scheme Programming Language and the Chez Scheme User's Guix, among other documents.

This package provides a library of procedures for formatting Scheme objects to text in various ways, and for easily concatenating, composing and extending these formatters efficiently without resorting to capturing and manipulating intermediate strings.

This package provides the SRFI-13 string library for Chicken scheme.

The threads implemented in CHICKEN are so called "green" threads, based on first-class continuations. Native threads that map directly to the threads provided by the operating system are not supported. The advantage of this is that threads are very lightweight and somewhat larger degree of determinism. The disadvantage is that execution of Scheme code on multiple processor cores is not available.

This CHICKEN Scheme library provides a facility for creating and using variant records, as described in the book Essentials of Programming Languages by Friedman, Wand, and Haynes.

This ``integer set'' CHICKEN Scheme library implements bit vectors. Bit-vectors provide an abstract interface to bitwise operations typically done with integers.