I’ve tried my best to capture the main academic and commercial efforts in this space. But I realize that, particularly on the commercial front, the entry is likely to attract attention from enterprise search vendors, particularly those that may feel slighted from not being included in the entry. I also realize that, despite my concerted attempt to write the entry from a neutral point of view, Wikipedia editors may have a knee-jerk reaction that I have a conflict of interest because my association with Endeca. I do think, however, that Endeca is one of the few notable vendors associated with faceted search, and that it is appropriate for Endeca to receive particular mention in the history of its commercial application.
I respect the challenge that Wikipedia editors face, especially when they are curating content outside their areas of expertise. As before I call upon the readership here to help out. If you see anything missing, add it! If you see anything wrong or misleading, fix it! Remember: ask not what Wikipedia can do for you; ask what you can do to improve Wikipedia.