When I was a kid, I used to come here. I worked on a game engine. It has been sitting on my hard drive for a while now. It has lots of potential.
I've decided to release it on GitHub under fuz/jspkmnengine
It's probably not for the faint of heart but the engine supports path finding and a rudimentary multiplayer server (no battling unfortunately). Tiles work by just loading a picture and use that as a map. Then you just click what you want to be solid.
It'd be great if you could include some more detail about the project. Maybe throw in some screenshots and a direct link? I'm going to lock this for now, but when you've got some more content to include, feel free to post it again.