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

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

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.

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

Ixion is a library for calculating the results of formula expressions stored in multiple named targets, or "cells". The cells can be referenced from each other, and the library takes care of resolving their dependencies automatically upon calculation.

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

Libpagemaker is a library that parses the file format of Aldus/Adobe PageMaker documents. Currently it only understands documents created by PageMaker version 6.x and 7.

Liblangtag implements an interface to work with tags for identifying languages as described in RFC 5646. It supports the extensions described in RFC6067 and RFC6497, and Extension T for language/locale identifiers as described in the Unicode CLDR standard 21.0.2.

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.

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

libqxp is a library and a set of tools for reading and converting QuarkXPress file format. It supports versions 3.1 to 4.1.

Libzmf is a library that parses the file format of Zoner Callisto/Draw documents. Currently it only understands documents created by Zoner Draw version 4 and 5.

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.

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.

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

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

Libmspub is a library that parses the file format of Microsoft Publisher documents of all versions.

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

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

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

Dragonbox generates a pair of integers from a floating-point number: the decimal significand and the decimal exponent of the input floating-point number. These integers can then be used for string generation of decimal representation of the input floating-point number, the procedure commonly called ftoa or dtoa.

The libnumbertext library provides language-neutral NUMBERTEXT and MONEYTEXT functions for LibreOffice Calc, available for C++ and Java.