/e/ OS is the brainchild of Gaël Duval, one of the developers that created Mandrake Linux, which is now known as Mandriva Linux. Formerly Eelo, /e/ is a privacy-minded mobile operating system. Based on LineageOS, which is in turn based on the late CyanogenMod, /e/ is an Android derivative and maintains app compatibility.
However, because of the un-Googling of the operating system, which any Android savvy users will understand is a large task, many apps that rely on Google’s services are left unusable. To remedy this issue, /e/ employs the MicroG package. It’s an open source subset of Google’s services that respects privacy. This allows many apps to work, but far from all.