Fraction is a generic game engine targetted at developers who are new to game programming. It differes from other engines that are available though, because developers are encouraged to use strong design patterns and other techniques often missed. Fraction offers helper classes for things such as a state manager and scene graphs, making it easier to understand and try yourself.
The engine also has a quite impressive set of features, that are constantly expanding. Fraction initially started as just a learning project - an engine I could self-tutor myself with. However, I think I've accomplished this goal so well - it's worth releasing!