So, I've released the current source code of TTDX Editor
. The code is written in VB6, and hasn't properly been touched in some time. It is probably a bit of a mess. I was working on some enhancements back in 2013 but haven't really had time to finish them. I was also working on a C# version, which may one day see the light of day...
If anybody's interested in poking around with it, though, then please take a look at the repository. Any questions, I'll try to answer them.
Note that TTDX Editor is now licensed under the GNU General Public Licence v2.