and doesn't look too bad. You buy it from them, and install it on your server (or they'll install for you) so that you, or your clients can manage the site content remotely.
These systems are ideal where your client wants to have access to say, update an online newsletter, or add/remove items to/from a catalogue. Essentially it's a Perl/PHP/ASP (depending on server type) script, nothing more.
The caveat with these systems is that they'll only work in Internet Explorer on the client computer - as far as editing is concerned, you can see the site in any browser of course - and you can't use an Apple Mac. At US$179:00 for the single site licence I suppose it's not too bad, it depends on what your client's budget is.