I'm working on a 3D editor called DeleD, written in Delphi 6 and OpenGL and to be found on http://www.delgine.com. Been working on it in my spare time for a few years until sometime last year a friend of mine started to help me out. Now, with around 40 downloads a day, it's being used by thousands of people worldwide and becoming more and more popular for creating game-content.

I like to think it's the perfect proof of what can be achieved with Delphi and OpenGL combined.