I've been working with a few web application vulnerability scanners lately and was looking for alternatives. The current pool I've pulled from includes Cenzic's hailstorm, Grendel-Scan, and the free version (xss only) of Acunetix's scanner.
So far I've been impressed with hailstorm's functionality, however; the 50K per license price tag is an issue when multiple scans need to be run at the same time.
Grendel-Scan, a free, open-sourced scanner, provides a solution to the cost issue; however, is less robust than hailstorm.
Acunetix's scanner impressed me the least of these three, but as I mentioned above, I only used the free version.
What I'm looking for is a list of alternatives. More important than the cost is the functionality and coverage the tool provides.