What is EFL?
These provide both a semi-traditional toolkit set in Elementary as well as the object canvas (Evas) and powerful abstracted objects (Edje) that you can combine, mix and match, even layer on top of each other with alpha channels and events in-tact. It has 3D transformations for all objects and more.
Enlightenment 17
Enlightenment 17 (E17) is the flagship application to the EFL libraries. This window manager for Linux based systems is built entirely upon EFL, which enables it to be graphically pleasing, as well as extremely lightweight and fast.
An Enlightenment 17 desktop
Elementary
Elementary is widget toolkit written with Evas, Ecore and Edje (the core components of EFL). It is extremely fast to develop with as there are a huge amount of widgets available, which means less 'boilerplate' coding. Elementary is designed to be touch screen friendly, and can be scaled for ease of use on small screens.
A number of Elementary test widgets