Open-source business models continue to permeate the enterprise applications market, with BPM (business performance management) the latest software to get a makeover, courtesy of formerly closed-source vendor Adaptive Planning. The BPM software vendor, which targets midmarket and departmental users, officially released <A HREF="http://www.cio.com/blog_view.html?CID=23907">Adaptive Planning Express Edition,</A> an open-source version of its product, Tuesday at the LinuxWorld conference in San Francisco.