Please note: The following slides are mainly in Korean and some English!
The slides below are by Daniel Juyung Seo, who is an Enlightenment Committer and a Samsung Engineer. He shows what EFL is and some of the history behind it. He also shared the open source contribution activities by showing how he became an open source committer and how developers can contribute to an open source project:
EFL stands for Enlightenment Foundation Libraries (EFL) and is a set of libraries for window manager and many kind of applications. Enlightenment window manager is made by EFL and Tizen adopted Enlightenment as its window manager. EFL is one of the core libraries in Tizen and consists of many libraries as you can see from the links below:
The official EFL website is http://www.enlightenment.org