The libffi library provides a portable, high level programming interface to various calling conventions. This allows a programmer to call any function specified by a call interface description at run-time.

FFI stands for Foreign Function Interface. A foreign function interface is the popular name for the interface that allows code written in one language to call code written in another language. The libffi library really only provides the lowest, machine dependent layer of a fully featured foreign function interface. A layer must exist above libffi that handles type conversions for values passed between the two languages.

libFTDI is a library to talk to FTDI chips: FT232BM, FT245BM, FT2232C, FT2232D, FT245R and FT232H including the popular bitbangmode. To use libftdi without root privileges it is necessary to install the necessary udev rules. This can be done by extending udev-service-type in the operating-system configuration file with this package, as in:

(udev-rules-service 'libftdi libftdi #:groups '("plugdev")

Additionally, the plugdev group should be registered in the supplementary-groups field of your user-account declaration. Refer to info "(guix) Base Services" for examples.

libidn is a library implementing of the Stringprep, Punycode and IDNA specifications. These are used to encode and decode internationalized domain names according to the IDNA2003 specifications. It includes native C, C# and Java libraries.

Libidn2 is an internationalized domain library implementing the IDNA2008 specifications. Libidn2 is believed to be a complete IDNA2008 implementation, but has yet to be as extensively used as the original Libidn library.

C library to manipulate Phidgets

Libexttextcat is an N-Gram-Based Text Categorization library primarily intended for language guessing.

Libfreehand is a library that parses the file format of Aldus/Macromedia/Adobe FreeHand documents.

Orcus is a library that provides a collection of standalone file processing filters. It is currently focused on providing filters for spreadsheet documents. The library includes import filters for Microsoft Excel 2007 XML, Microsoft Excel 2003 XML, Open Document Spreadsheet, Plain Text, Gnumeric XML, Generic XML. It also includes low-level parsers for CSV, CSS and XML.

Libe-book is a library and a set of tools for reading and converting various reflowable e-book formats. Currently supported are: Broad Band eBook, eReader .pdb, FictionBook v. 2 (including zipped files), PalmDoc Ebook, Plucker .pdb, QiOO (mobile format, for java-enabled cellphones), TCR (simple compressed text format), TealDoc, zTXT, ZVR (simple compressed text format).

The libwpg project provides a library and tools for working with graphics in the WPG (WordPerfect Graphics) format.

Libcdr is a library that parses the file format of CorelDRAW documents of all versions.

libstaroffice is an import filter for the document formats from the old StarOffice (.sdc, .sdw, ...).

Libetonyek is a library that parses the file format of Apple Keynote documents. It currently supports Keynote versions 2 to 5.

LibCMIS is a C++ client library for the CMIS interface. It allows C++ applications to connect to any ECM behaving as a CMIS server such as Alfresco or Nuxeo.

Libabw is a library that parses the file format of AbiWord documents.

libepubgen is an EPUB generator for librevenge. It supports librevenge's text document interface and--currently in a very limited way--presentation and vector drawing interfaces.

Hyphen is a hyphenation library using TeX hyphenation patterns, which are pre-processed by a perl script.

Libvisio is a library that parses the file format of Microsoft Visio documents of all versions.

Libwpd is a C++ library designed to help process WordPerfect documents. It is most commonly used to import such documents into other word processors.

Unoconv is a command-line utility to convert documents from any format that LibreOffice can import, to any format it can export. It can be used for batch processing and can apply custom style templates and filters.

Unoconv converts between over a hundred formats, including Open Document Format (.odt, .ods, .odp)), Portable Document Format (.pdf), HTML and XHTML, RTF, DocBook (.xml), .doc and .docx), .xls and .xlsx).

All required fonts must be installed on the converting system.

MyThes is a simple thesaurus that uses a structured text data file and an index file with binary search to look up words and phrases and to return information on pronunciations, meanings and synonyms.

Libwps is a library for importing files in the Microsoft Works word processor file format.

LibreOffice is a comprehensive office suite. It contains a number of components: Writer, a word processor; Calc, a spreadsheet application; Impress, a presentation engine; Draw, a drawing and flowcharting application; Base, a database and database frontend; Math for editing mathematics.

Librevenge is a base library for writing document import filters. It has interfaces for text documents, vector graphics, spreadsheets and presentations.