hiperGL - Is a 2D OpenGL hardware accelerated blitter, graphic loader, frame manager, a DIV like sprite system, and more utilities for creating video games. It works under SDL. It's portable, and easy to use.
ParaDef (Parametric Definition System) is a complete CAD/CAE/Product Development solution. ParaDef encompasses all aspects of product development into a single IDE, enabling rapid development of new products and in-depth analysis of existing solutions.
The UT library is intended to simplify and present a uniform interface across some common platforms to commonly required features that often have platform-specific APIs on those platforms. Presently, the target platforms are Windows, Linux, and Mac.
a minecraft server
Many minecraft servers are but some of them support different version of minecraft by different protocols of its release. This server will need to support different versions of the game as well as plugins to otherwise improve creativity. It will also feature a simple interface for ease of use
A compact framework for managing OpenGL graphics in C language.