Maybe Sayuri is the most flequently updated chess engine of all. The latest one is published on 7th of May. Thanks go to Alex for notifying about the update.
As the updates are frequent, the improvements that each one brings in may be limited to some ELOs.
In Rapidroid, it's impossible for me to follow all Sayuri updates and i will finish testing 2016.04.09 for the moment.
Download Sayuri 2016.05.07: HERE