Another very useful and easy to use tool is GLScene. It is an open source OpenGL 3D library. It makes doing 3D graphics work very intuitive. I've used it for a couple of projects and was very happy with it. It's very easy to get started with.
Another tool I've been very happy with is DelphiWebScript, a very rich scripting engine using Delphi syntax. Don't let the 'Web' part in the name distract you, it's a general purpose script engine. It is similar to PascalScript from RemObjects, but it has more complete language syntax, allowing nested routines, classes in script, etc. I think PascalScript may be stronger on producing dynamic calls to compiled routines. DWS includes some tools for automatically wrapping existing Delphi classes for use in script (a friend of mine worked on that), so it is very easy to expose various Delphi objects to the script. If you try this project, pull the code from SVN.
These tools work very well together. One of my projects involved creating 3D scenes from user-produced script. It was amazing how easy it was to do this with those two tools.
Both of these are 'mature' tools that have not seen significant development for a few years. As far as I am aware they have not been brought forward for use in Delphi versions post-D7.
Grippy has approximately 30,000 hours of Delphi coding experience. srsly.