Forgotten Tale is a game I've started programming around 2008.
The idea was to develop a Tower Defense, that directly, or only by using self-written code, builds upon OpenGL. During development, I implemented a lot of features that would be worth creating an own library for. Thus, I finally seperated the whole rendering code from the game itself and called it the Tower Engine, which I still actively develop.
I haven't been working on the game for quite some time now and I am not sure in general if or when I am going to continue working on it. Nevertheless, there's already a playable Alpha version: Link