osu!evolution is basically a fork of the original osu!droid app, but with many new features added that are similar to the official osu! client. As of the latest version (1.6.6), features include:
Online bancho-like performance ranking (does not have anything to do with your osu.ppy.sh account)
Ability to use it as a music player
Unstable rate bar
Mods (all except Flashlight)
Ability to save your own replays and view the top 10 replays for a given beatmap
