We get a lot of questions about whether you can use Arbortext with the Open Toolkit. The answer is, "Yes, of course," but any further details are difficult unless you know what the questioner means by that.
"Arbortext" is a portfolio of products that includes an editor, multiple publishing engines (for both typical and magazine-quality publishing), a content management system, a styling tool (so non-programmers can create stylesheets), a DTD/configuration tool, a dynamic link manager, and an illustration tool.
Which part of Arbortext do you want to use with the DITA OT? And why? (but that's a different question...)
For example, if you want index processing, you've got to swap out FOP. There's one place you can use Arbortext. You can use Arbortext editor as your DITA editor, that's another place. Want to create multi-channel stylesheets without having to learn XSL and XSL-FO, well, that's a third place. Want to kick off the DITA OT from inside the CMS? That's four.
So, because there are so many ways to answer this question, we've scheduled two DITA- and OT-specific sessions to our new Arbortext Monster Garage webinar series.