The Open Source Initiative and Open Source movement have definitions of Open Source that are almost completely equivalent to the Free Software Foundation's definition of Free Software. However, "Open Source" is not a trademark or anything like that, and people are legally free to use the phrase as they like. Since the site refers to a 30-day free trial, I'd imagine that they aren't using "Open Source" in the same sense.
(Unfortunately, there's nothing anybody can do to stop the confusion. There was "open source" software for a long time before the OSI, which typically meant software you could get the source for. EDIT: The historical usage is dubious, but "Open Source" is simply too descriptive to be trademarked. You can trademark a made-up word ("Pentium") easily, or a word used in another context ("Vista"), but it's real difficult to trademark a descriptive term ("Open Source"). Without trademark protection or the equivalent, there's no legal way to stop anybody from supplying their own meaning for the phrase.)
Even if they were, they could still charge. If you look at the OSI's rules for Open Source licenses, you'll see that all OS licenses must permit commercial use of the software, including selling it for whatever the seller can get for it. Similarly, Free Software (as defined by the FSF) is not necessarily free of charge, but does give you certain freedoms with the code.