Behind Firefox OS and Tizen, and way behind Windows 10 Mobile, there’s another alternative mobile operating system that’s fighting to take the number three spot in the mobile market behind Android and iOS, and it’s called Sailfish OS. From a small Finnish startup by the name of Jolla, this quirky operating system has made some significant progress over the past couple of years, and now it’s ready to enter its second stage. Starting now, Jolla will be releasing Sailfish OS to a handful of “advanced users” before eventually bringing the next-generation version to all users.Â