Lineage is a good alternative, there's also Sailfish as a fuller Linux system. These have similar advantages and disadvantages, the major issues are the drivers

Lineage is a good alternative, there's also Sailfish as a fuller Linux system. These have similar advantages and disadvantages, the major issues are the drivers are not great in particular for cameras, and the reliance of some apps on Play Services (which of course has been carefully calculated by Google for that purpose).