A general-purpose Web API written in C

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

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

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

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

A C library for reading and writing files containing sampled sound. Project news, features list, API reference, FAQ, and download. [LGPL]

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]

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]

A small, static libc optimized for small size.

Project supported by BBC research and development and Fluendo to develop open source libraries for the Dirac video codec. Include developer information and frequently asked questions.