A small C++ 2D action RPG engine, designed to test procedural content generation techniques
You can see screenshots of a small game built with this engine called Aventura 4 here:
A video can be found here:
And you can play directly on-line a version compiled to JavaScript via emscripten here: https://dl.dropboxusercontent.com/u/3303662/BrainGames/Aventura4-2.4/A4Engine.html
I developed this engine first for fun, but second to be used in my Game AI class for some class projects. I currently use it for the procedural content generation assignment (see more details here: https://www.cs.drexel.edu/~santi/teaching/2016/CS387/PCG/projectA4PCGv2.3.html