LineageOS support exists and is currently being maintained by the community, with LineageOS 14.1 (Android 7.1.2 "Nougat") being the latest official port for the device. Currently there is an ongoing effort to port mainline Linux to the phone, with most of the devices already supported except for voice calls and the cameras. Work is being done to make the Droid 4 supported by Maemo Leste.
