Ported version of Sony's Marshmallow Concept launcher works on all Android 5.1.1 phones
The launcher works on any non-rooted device, but just in case you're rocking a rooted Android 5.0 (or higher) smartphone, there's a second download option that fixes some of the known bugs, comes with a few bundled themes, and should run smoother overall.
Judging on a limited test-drive of the xMarshmallow Concept Launcher on a Google Nexus 4 running Android 5.1.1 Lollipop, we can say that we're looking at a fully fledged launcher with a variety of customization options.
By default, the launcher comes with a MIUI-like homescreen style that replaces the app drawer with a quick search button. Tap this button, and aside from the search function, you'll also be presented with a list of your most-used apps as well as with a list of recommended apps. If you'd rather get a standard Android homescreen that shows the app drawer button centered in the lower part of the home screen, you can flip a toggle in the settings screen.
If you're interested in testing the xMarshmallow Concept Launcher, head on over to the source link below, where an APK file is available for download. Just set your Android handset to accept apps from unknown sources, and you'll be set to go.
source: xMarshmallow Concept Launcher
source: xMarshmallow Concept Launcher
Things that are NOT allowed: