Jolla announced the availability of Sailfish X for Sony Xperia 10. They also introduce a campaign giving all existing Sailfish customers a nice offer on the Sailfish X licence for Xperia 10, and for other devices.
A premium mobile Linux operating system from Jolla. Sailfish OS is a continuation of legendary MeeGo (of Nokia fame).
Sailfish OS is an alternative for mainstream offerings for a stable and secure daily driver in smartphones. Many Sony Xperia devices +much more supported now!
SailfishOS or SOS for short.