Quark (providers of Quark Xpress), is Adobe's strongest competitor against Pagemaker. I really doubt the FTC would allow Adobe to take them over (as per a previous message) as this would eliminate Pagemaker's only real mass-market competitor.
Quark is a software company whose primary product, QuarkXPress, is considered to be the best or one of the best desktop publishing software product for the Macintosh and Windows by design professionals. It's only real competition is Adobe's PageMaker, which is constantly jockeying with Quark for the top spot. I use the software regularly, and its great! The company, however, is not known for being responsive to users or vendors and is not any computer users choice company to deal with in terms of product support or customer relations.