RetroXRBWallet (https://github.com/jamescoxon/RetroXRBWallet) is a pathfinder design, to demonstrate and test some of the technology which will be used in the mobile/light wallet. It is purposefully retro to make it fast and efficient.
 
Currently works on Mac OS X and Linux, we are going to make some Windows binary soon.
 
For more discussion see #development on RaiBlocks Discord

Check out https://www.youtube.com/watch?v=Sb8u9YyuBzk for a guide to setting up the wallet.