http://erebusrpg.sourceforge.net/index.html Real-time RPG for PC/tablet/phone Qt-based c++ as much as possible, but some java for android to load the ndk parts. It's 2D which is what you wanted.
Ogre 3D is mind-blowing and has some blender/collada xml model support for pc. Android is possible if using jmonkey last time I checked.