Raspberry Pi Desktop System: PIXEL OS
Based on the Debian-derived PIXEL will bring the Raspberry Pi experience to x86, as the Raspberry Pi Foundation has declared, "We are not just creating the best desktop environment for the Raspberry Pi, but the best desktop environment, period."
The Raspberry Pi Foundation has ported PIXEL OS, released this September, to PCs and Macs. (Both PC and Mac are actually based on x86 architecture, while the Raspberry Pi is based on ARM series CPUs, making this successful port very significant)