libmng -THE reference library for reading, displaying, writing and examining Multiple-Image Network Graphics. MNG is the animation extension to the popular PNG image-format.
Haru is a free, cross platform, open-sourced software library for generating PDF written in ANSI-C. It can work as both a static-library (.a, .lib) and a shared-library (.so, .dll).
Various coding projects by the members of the BlaatSchaap Website. The latest project is a multi-scrobbler that will scrobble to both last.fm en libre.fm. Another project is a modular IRC bot. both protocol and other functionality are loadable plugina.
Multi-Language Wrapper Collection for the Irrlicht Engine
2licht's aim is to provide a collection of wrappers for the popular Irrlicht Engine (http://irrlicht.sf.net/). It is still in development; the first wrappers to be released will be the C and Object Pascal interface; followed by a .NET library.
IrrlichtPas provides Pascal bindings to the Irrlicht 3D engine to enable using Irrlicht with Delphi on Windows and FreePascal on Windows, Linux and Mac OS X.