GLScene
   3D OpenGL based library for Delphi. [Open Source, Mozilla Public License]
   http://glscene.sourceforge.net/

Sulaco
   Delphi, OpenGL, game development and graphics site. It currently have over 160 tutorials online.
   http://www.sulaco.co.za/

Vampyre Imaging Library
   A native ObjectPascal image loading, saving and manipulation library. [Open source, MPL]
   http://imaginglib.sourceforge.net/

efg's Computer Lab
   A large number of Delphi projects involving Image Processing, Color, Graphics, Mathematics, Fractals and Chaos.
   http://www.efg2.com/Lab/