The Enlightenment Project covers more than simple window management. It also includes the EFL, or Enlightenment Foundation Libraries: a framework which provides a great deal of functionality. Below you can find documentation for these libraries:

Ecore operating system abstraction and integration.
Edje layout and theme library with super powers.
Eet binary data parser and serializer.
Eina data types and low-level/basic abstractions.
Eio asynchronous input/output
Eldbus D-Bus integration.
Evas drawing canvas.