LibU
LibU is a multiplatform C library which comes under a BSD-style license. It includes many interdependent modules for accomplishing several tasks: memory allocation, networking and URI parsing (rfc2396), string manipulation, debugging and logging in a very compact way, plus many other miscellaneous tasks.
It has small footprint (about 70KB for the default configuration), it is modular, and has a multiplatform nature, making it an ideal candidate for embedded systems. KLone is an example of such usage.
Resources
Download
Download the latest version (1.2.1) or browse through the latest updates in the ChangeLog file containing notes about newly added features and bugfixes.