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- Matrix2D

A library implements a set of functions allowing to manage bi-dimensional matrix with languages C and C++. Matrix2D contains also several functions of images processing. [Free for personal use]
http://dev.tplanet.net/Matrix2D/
- MyLibC

A glibc clon for windows.
http://mylibc.sourceforge.net/
- Network Wrappers Library

An thread-safe, protocol independent UNIX networking API. [Open source, GPL]
http://libnwrap.sourceforge.net/
- Sglib

A generic library for C. It extensively uses the preprocessor for generic implementation of sorting algorithms on arrays, lists, sorted lists, red-black trees. The library operates on user types and does not depend on a particular memory management system. [Open source]
http://www.xref-tech.com/sglib/
- Math a la Carte

Collections of mathematical software in Fortan and C. Software is free for some uses and can be purchased for others. Much of the software was developed at the Jet Propulsion Laboratory.
http://mathalacarte.com
- mar

A library that manages archives using a simple binary file format designed to store meta and user data side by side. A mar file may be useful in situations where a full-scale database is unsuitable. [Open source, MIT License]
http://www.emantic.co.uk/mark
- libZI

A portable configuration file API that utilizes XML for data storage and retrieval. libZI provides a typesafe way of serializing configuration data into a file in a manner consistent to XML standards. [Open source, GPL]
http://libzi.sourceforge.net/
- LZO

Portable high-speed lossless data compression library written in ANSI C.
http://www.oberhumer.com/opensource/lzo/
- MAlib

C library for Media Analysis, Motion Analizing, Movie Architecture, and Media Authoring. [Open source, LGPL]
http://www.malib.net/
- SoftC Database Library

A library of programming tools for programmers who want to develop their xBASE applications in C without the limitations of using one xBASE language. Provides functions to access data, index and memo files for dBASE, Clipper and FoxPro. Supports multi-user access using native locking methods. . By AM Research.
http://www.amr-usa.com/
- SQATT

A library providing Inter Process Communication support functions.
http://www.geocities.com/sqatt_develop/
- Vermont Views Plus

A C programming library for creating cross platform user interfaces across Unix, Linux, Posix, VMS, DOS and Windows.
http://www.vtsoft.com/products/vviews4.html
- W3C Sample Code Library

A general-purpose Web API written in C
http://www.w3.org/Library/
- WM_MOTIF

C library allows developers to port code from Windows to Unix or Linux systems. By Software Uno.
http://softwareuno.com/
- xnprintf() family functions for C/C++

A small source file for 16/32/64-bit compilers. Provides snprintf() and others. [GPL or modified BSD license]
http://domainename.com/software/xnprintf.html
- UniquE RAR File Library

The URARFileLib is a platform-independent, small and fast static library for decompressing RAR files (RAR archives are created with WinRAR). Full RAR v2.0 file format support of all compression methods, including multimedia compression and encoding.
http://www.unrarlib.org/
- uClibc

C library optimized for embedded systems. Free: GNU LGPL.
http://www.uclibc.org/
- Standard Function Library: SFL

By iMatix Corp., portable function library for C/C++ programs; many years development; written in ANSI C; ports: DOS, OpenVMS, OS/2, most Unix, Windows; full sources and documentation (HTML); given as Open Source software for the benefit of Internet community.
http://www.imatix.com/html/sfl/
- Template2doc

Library that allow generation of html page using templates. A template contain specific keywords that tell the routines where to insert data. Support insertion of table data.
http://www.algonet.se/~thunberg/template2doc/
- ubiqx

A free and open source library of simple programming utilities (written in C), including linked lists, AVL and Splay balanced binary trees, a simple caching system, Sparse Arrays. [Open source, LGPL]
http://ubiqx.org/
- libspopc

A simple pop3 client library to be used by MDAs and/or MUA. one of libspopc's purposes is to help non-network-aware C developers to host easily a pop3 mail client in their programs. However, libspopc provides also a classical socket-level API for those who prefer. [Open source, LGPL]
http://brouits.free.fr/libspopc/
- libESMTP

Library for Posting Electronic Mail: manages posting email using SMTP to a preconfigured MTA. Can be used as part of a Mail User Agent or other program that must post email. Free: GNU LGPL.
http://www.stafford.uklinux.net/libesmtp/
- diet libc

A small, static libc optimized for small size.
http://www.fefe.de/dietlibc/
- The Dinkum C Library Reference

Large number of functions from the standard C library.
http://www.dinkumware.com/htm_cl/index.html
- djblib

Source-file library derived from the many fine software packages written by D.J. Bernstein; collects files from various packages into a central repository from which code is easy to use in new programs.
http://www.superscript.com/djblib/intro.html
- Embedded File System for Secure Digital (SD) Media

FAT12 and FAT16 ANSI C API libraries to implement file storage on SD removable media disks for Freescale embedded microcontrollers. The development environment is implemented for both Metrowerks Code Warrior and ImageCraft ANSI C compilers. [Commercial]
http://www.inmotiondesign.ca
- DateLib

A portable library for all kinds of date and time calculations, provides auto-analyzing date and time parsers.
http://www.datelib.de/index.shtml.en
- Crusher Data Compression Toolkits

Cross-platform compression libraries. [Open source, Commercial]
http://www.dcmicro.com/crusher/
- AccentC free scripting language library

Add scripting functionality into application. Features included: simple interface, built-in GUI, debugger, error handling.
http://www.geocities.com/accentc/
- Better String Library

A safe and fast string library. It's buffer overflow and aliasing safe, high performance. The library includes a robust C++ wrapper that uses overloaded operators and rich constructors to make the CBstring struct a natural and powerful string abstraction.
http://bstring.sourceforge.net/
- Cheap Threads

Open source C library implementing synchronous multithreading with prioritized scheduling and message passing.
http://home.swbell.net/mck9/ct/
- The Endpoint Library

Library for winsock applications.Currently only compatible with winsock v1.1.
http://tangentsoft.net/endpoint/
- FFTW Home Page

Fast free C FFT library; includes multi-dimensional, real-complex, and parallel transforms.
http://www.fftw.org/
- IRCG

A library for dispatching messages to huge groups of users over an arbitrary number of separate communication channels in real-time using IRC protocol. [Open source]
http://schumann.cx/ircg/
- jclassinfo

Information extractor and disassembler for Java classes. Backend code available as a C library. [Open source, GPL]
http://jclassinfo.sourceforge.net/
- Levenberg-Marquardt non-linear least squares algorithms in C/C++

Package containing double and single precision flavors of the Levenberg-Marquardt algorithm. Included are versions with analytic and finite difference approximated jacobians. [Open source, GPL]
http://www.ics.forth.gr/~lourakis/levmar/
- liberror

A library for C and C++ that solves the allegedly simply task of printing messages. Thus, it is essentially a feature-rich substitute for fprintf(stderr,...).
http://www.theiling.de/projects/liberror.html
- Gopt

An ANSI C library, for parsing command line arguments and options according to GNU standards. [Open source, GPL]
http://gopt.sourceforge.net/
- GNU Scientific Library

A free numerical library for C programmers. [Open source, GPL]
http://www.gnu.org/software/gsl/
- Fingerprint Verification System

An easy to use library that allows programmers to integrate fingerprint technology into their software without specific know-how. Fast, easy to use, and small; great for embedded systems. [Open source, MPL]
http://fvs.sourceforge.net/
- Flux

A library for integrated data storage and indexing, marshalling, transfer and encryption. It also features a slew of utility functions for various purposes. It is written in C, using the GLib paradigm. [Open source]
http://www.fluxlib.org/
- ForbiSoft

ForbiSoft DIB Library provides platform independent bitmap loading. ForbiSoft ToolTip Library provides platform independent tooltip display. Target Win32 or Windows CE with the same code. Shipped as source code and will compile with Microsoft eMbedded 3.0 and Visual Studio 6.0. [Commercial]
http://www.forbisoft.com/
- a386

C programming library providing a virtual i386 running in protected mode.
http://a386.nocrew.org/
- XMLproc

Minimal non-validating parser written in C. Implements subset of SAX with namespaces. Public domain.
http://www.saunalahti.fi/~samiuus/toni/xmlproc
- Pyxie [XML.com]

Article on Pyxie, a "simpler" representation of XML, and its associated tools, programmed in C. (March 15, 2000)
http://www.xml.com/pub/a/2000/03/15/feature/index.html
- SCEW - Simple C Expat Wrapper

An easy interface around the XML Expat parser. [Open source, LGPL]
http://www.nongnu.org/scew/
- RXP

A validating parser written in C and available under the GPL.
http://www.cogsci.ed.ac.uk/~richard/rxp.html
- The Expat XML Parser

A XML parser library written in C. It is a stream-oriented parser in which an application registers handlers for things the parser might find in the XML document (like start tags). [Open source, MIT License]
http://expat.sourceforge.net/
- libxml - The XML library for Gnome

A part of the GNOME framework, but does not require GNOME. It provides interfaces similar to DOM and SAX and an XPath implementation. Released under W3C-IPR and GNU-LGPL.
http://www.xmlsoft.org
- Expat

A non-validating XML 1.0 parser written in C.
http://www.jclark.com/xml/expat.html
- SVGAlib

A low-level graphics library for Linux. It augments the C programming language, which doesn't provide support for graphics.
http://www.svgalib.org/
- Ilib

A library (and some tools and examples) written in C that can read, create, manipulate and save images. It is capable of using X11 BDF fonts for drawing text. It can read and write PPM, XPM, GIF, PNG and JPG image format. There is a Perl module included with the distribution. [Open source, GPL]
http://www.k5n.us/Ilib.php
- GraphiC

A library of routines that enable you to embed high quality graphics in your programs.
http://www.sciend.com/
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