FreeFT: isometric action game engine
FreeFT is an open-source, real-time, isometric action game engine. inspired by Fallout Tactics, a game from 2001 created by an Australian company, Micro Forte. It requires assets from this game to work, so if you want to run the demos, you have to own Fallout Tactics.
Engine works very well on low end platforms with integrated GPUs. It required a caching system for textures which minimized OpenGL state changes & fast tile-based sorting algorithm for sprites.
FreeFT also has an easy to use tile & entity editor.
Game engine supports lots of actors with efficient dynamically updated navigation maps.
Multiplayer mode was also implemented, based on UDP protocol. It works smoothly even under stress test where 75% of packets are dropped.