Omni rom is one of the top 5 AOSP roms when it comes to customization options and innovation. They are most well known for the Omni Switch app which is there version of multitasking. For the past few months there have been plenty of unofficial builds of Omni 5.1.1, but today Omni announced that they had begun official nightly builds of Android 5.1.1. Omni is supported on over 50 devices including the Nexus 6 and Galaxy S5 and others. Grab this rom for your device now.
Via Omni