Our isometric tilemap engine, Qiso, was released to the Corona marketplace this morning. I really, really hope some of you find it useful.
The engine is a work in progress. Currently it'll import maps created in the Tiled map engine, and implements all of the functions you need for adding and moving characters around (A* path-finding is built in) or manipulating tile layers on the fly. In the coming weeks we'll be adding a dynamic lighting system, positional audio system, a menu system for multi-action tile clicks, and a layer opacity system for when characters disappear behind roof/wall type layers. In a nutshell Qiso will grow alongside the games we produce using it ourselves. Such additions will of course be implemented with backwards compatibility in mind.