I've been contacted by a few web crawler vendors over the last couple years. Normally, they just send a solicitation email that I delete. Reason being is that there are plenty of open source web crawler apps out there. If you want something more robust then Blackboard Ally is the way to go instead of using a third party vendor. Recently, I was contacted by a rep with Siteimprove, a third party web crawler app. Be aware that he is claiming to work with Blackboard with "numerous districts across the country." This, to my understanding, is not true and just a sales tactic. He was also a bit rude when I told him we were not interested and kept pressing the issue until I had to hang up.