C-Pluff is a plug-in framework for C programs. C-Pluff focuses on providing core services for plug-in interaction and plug-in management. It aims to be platform neutral and supports dynamic changes to plug-in configuration without stopping the whole application or the framework.
Source Metrics was a web site producing software metrics and contributor data for free, libre and open source software (FLOSS). You could describe it as a miniature version of Ohloh. Its implementation was and still is fully open.
The project was retired after Ohloh came around because Ohloh
... [More] provided the same metrics and more in a much larger scale.
In contrast to Ohloh, Source Metrics code was looking for contributor names in the actual source, quickly providing a very complete contributor history but filtering this data turned out to require too much manual work. [Less]
Blokout is an open source Blockout clone featuring 3D OpenGL graphics. If you don't know the original Blockout it could be shortly described as 3D Tetris. It was originally written as a programming assignment for a computer graphics course.