It's Official, I have successfully tuned an 07 STI using Open Source products. I used Ecuflash for read/write. Had to use version 1.28 for some reason. Enginuity for it's xml defintions and logging. For some reason Enginuity would not save some of my changes to the maps. Ecuedit to edit the maps and for logging. Use ecuedit for most of the editing. I converted the enginuity definitions. And this worked well.
Check out the post in Power Bragging for all the results.