Sailfish is pretty great. Devices get industry leading software update support (the only device they ever dropped got 7 years of updates). Great UI. It even sup

Sailfish is pretty great. Devices get industry leading software update support (the only device they ever dropped got 7 years of updates). Great UI. It even supports a fairly good Android emulation mode if you want to run some Android apps. You can shut down the Android emulator when not in use for power usage and peace of mind. EDIT: The devices are cheap too, but aren't slow. Typical cost is less than $250 including both the device and software license. The software is mostly open source, but there are a few licensed components. It is possible to use Sailfish without the proprietary bits for free.