I just added a new repository on GitHub containing the tools from my Graphviz / diagram related posts.
The repository can be found at: http://github.com/vidarh/diagram-tools/tree/master
These are the ones included and the appropriate articles:
The time has come. All the previous parts to this series were mostly written a long time ago, but went through various cleanups. I originally said I had 20 lines up, but as I went through them many were consolidated into larger ones. This is the first ...
If you're following my compiler series you can now find a github repository here. For now I've just added the code published so far, but when I reach the end of the already written material I'll start making more fine grained commits.
Fork away :)