Say what? What about Cisco's IDS engine, which isn't Snort, and was originally WheelGroup? What about Intrusion's? What about Fortinet's? What about Enterasys' (Dragon)?

Two things happened to "intrusion detection":

* The concept failed, and

* The technology got rolled up into middleboxes as part of "IPS" (IDS plus filters) and "UTM" (all-in-one boxes).

There has been a vibrant "market" of IDS engines for over a decade.