In addition to Bologna version, Rattate Chess Nosferatu comes (came in 2010) with a definitive makeup. Actually this was the true v1.0 of the engine. There have not been any further updates since a long time. So you can consider the engine just "passed away".
Anyway, it may be interesting to keep Rattate as a retrospective piece of computer chess history transported to our handy devices. Useful for testing purposes and rating lists connected to the past...
While the previous Blologna version is rated 2194 in CCRL rating list, Nosferatu is ranked higher with 2246. Android port would be probably 2050 something, i guess.
Download Nosferatu version: HERE