Libraries

DEGUI
set of programs, C++ objects and C routines that allow users of Allegro's gui to make dialogs using better looking gui objects and extend the objects using more familiar normal C++ methods.
http://huizen.dds.nl/~deleveld/degui.htm

FreeBE/AF Library
a free project to create VBE/AF(an extension of VESA) video cards drivers [sub project off-sprung by Allegro]
http://www.talula.demon.co.uk/freebe/