C programming library providing a virtual i386 running in protected mode.

Add scripting functionality into application. Features included: simple interface, built-in GUI, debugger, error handling.

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.

Open source C library implementing synchronous multithreading with prioritized scheduling and message passing.

Cross-platform compression libraries. [Open source, Commercial]

A portable library for all kinds of date and time calculations, provides auto-analyzing date and time parsers.

A small, static libc optimized for small size.

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.

Fast free C FFT library; includes multi-dimensional, real-complex, and parallel transforms.

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]

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]

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]

A free numerical library for C programmers. [Open source, GPL]

An ANSI C library, for parsing command line arguments and options according to GNU standards. [Open source, GPL]

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]

Information extractor and disassembler for Java classes. Backend code available as a C library. [Open source, GPL]

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.

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]

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]

Portable high-speed lossless data compression library written in ANSI C.

C library for Media Analysis, Motion Analizing, Movie Architecture, and Media Authoring. [Open source, LGPL]

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]

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.

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]

A glibc clon for windows.

An thread-safe, protocol independent UNIX networking API. [Open source, GPL]

A C software library made of objects instanceable in according to Object Oriented Programming paradigms of incapsulation and data hiding. It contains objects that handle XML buffers, FTP connections, file system operations and more, for Linux environment. [Open source, MIT Licence]

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]

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.

Implementations for multimedia embedded devices using pure ANSI C language of some protocols including ITU G.723.1 codec, ITU H.245 codec. [Commercial]

A library providing Inter Process Communication support functions.

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.

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.

Large number of functions from the standard C library.

Library for winsock applications.Currently only compatible with winsock v1.1.

The library includes a memory hash table implementation, a key file implementation, and an ISAM file implementation. [Open Source, GPL]

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]

C library optimized for embedded systems. Free: GNU LGPL.

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.

A C programming library for creating cross platform user interfaces across Unix, Linux, Posix, VMS, DOS and Windows.

A general-purpose Web API written in C

C library allows developers to port code from Windows to Unix or Linux systems. By Software Uno.

A small source file for 16/32/64-bit compilers. Provides snprintf() and others. [GPL or modified BSD license]