Enlightenment started as a project to build a Window Manager for X11. That was way back in 1996. It has grown much since. It still produces this Window Manager, but it has evolved to also cover Mobile, Wearable and TV UI needs for projects such as Tizen as well as traditional the 'desktop' UI. We still push out releases, so see our download page for more details on the latest releases, or see our contribute page for source code repositories in their latest development state.
It also is in the transition from X11 to Wayland. We are fully committed to moving to Wayland eventually as this is definitely the future of the graphical display layer on Linux.
We still primarily support Linux for Enlightenment, but there is some effort (based on help and support from users and some developers) to support the BSDs.