I recently participated in a presentation at Dscoop Phoenix with three companies that I've known for over a decade: Pageflex, XMPie, and Marcom Central. We had joined a "Composition Engine Panel Discussion" with web-to-print luminaries Jen Matt (of web2printexperts.com) and Chris Reisz-Hanson.
It was quite an honor to be on this panel, but an even greater honor has been the opportunity to work with these companies' rendition technologies since they first came on the scene. I have been involved in solutions involving all four technologies, and I've met the developers critical to the success of the underlying rendition codebases. These range from: FusionPro, the composition engine under Marcom, which dates from the 1980s; to PageFlex, the PDF rendition library from BitStream also originating in the 1980s; to InDesign, dating from the late 1990s. InDesign is the engine that we and XMPie use - it was created in part by our staff.