GEL was ported on several boards: Several libraries are integrated. After they are built, the libraries are located in 'lib' and their associated includes are in 'include' top level directories.

libc	A library with the standard ANSI C functions (board independent; sprintf, printf, strcpy, strlen, malloc, free, ...)
libbot	Robots library (MIT 6.270 board) by Duane Gustavus (IR dectector, PWM motor controller, interrupt driven SCI, analog ports, ...)
libbsp	Board Support Package Provides low level SIO, eeprom and other functions (polling).
libgel	General Event Library Event and timer runtime; event driven board support.
libutil	Utility library Persistent C++ class
libgdm	Graphics Display Library Graphics operations (lines, circles, drawing, ...) for a 128x64 dot matrix LCD display.