Ported version of Sony's Marshmallow Concept launcher works on all Android 5.1.1 phones
Thanks to a couple of willing XDA-Developers, a ported version of Marshmallow Concept launcher is now available for a wide range of Android devices. Intuitively called the "xMarshmallow Concept Launcher" (we have a hunch that X stands for Xperia), the home screen replacement app is now available for any smartphone running Android 5.1.1 or newer.
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.
source: xMarshmallow Concept Launcher