GLScene - 3D OpenGL based library for Delphi. [Open Source, Mozilla Public License] - http://glscene.sourceforge.net/
Vampyre Imaging Library - A native ObjectPascal image loading, saving and manipulation library. [Open source, MPL] - http://imaginglib.sourceforge.net/
Sulaco - Delphi, OpenGL, game development and graphics site. It currently have over 160 tutorials online. - http://www.sulaco.co.za/
efg's Computer Lab - A large number of Delphi projects involving Image Processing, Color, Graphics, Mathematics, Fractals and Chaos. - http://www.efg2.com/Lab/