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.
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.
In the process of developing a Window Manager, A set of libraries were developed in order to achieve that goal. These libraries are known collectively as EFL. They cover a range of functionality from main-loop, to graphics, scene graphs, networking, widgets, data storage, IPC and much more.
For our libraries, our primary development environment is Linux, but we make an effort to support the BSDs as fully as possible, as well as OSX and Windows.
We eat our own dog food. We use our libraries not just to make Enlightenment but to also make other applications for regular every-day use. We make these applications available for free.
Even native Tizen applications use EFL for their development because we have focused on remaining lean and still featureful. Unlike many traditional toolkits, we have based ourselves around a scene graph from the ground up, making EFL very different in nature, yet allowing us to seamlessly switch from software rendering to OpenGL or any other mechanism that can be put in a render engine for the canvas scene graph engine we call Evas, as well as layer widgets and objects with alpha channels from the ground up and no special tricks.
This is by no means a complete list of applications, and we are not done making more. We may not have started the traditional way, but are building our library over time, and Tizen has another library brewing over there as well.