Websecurity (https://www.websecurify.com/) started as a normal web vulnerability scanner. It was very useful when the first application of AJAX started to appear in the world. Initially, it started as an open-source project, but recently, the company closed the code and released it as a commercial product. Currently, Websecurify does not exist anymore; it was changed to a product called SECAPPS, which is a web security scanner on demand, that you can open in your web browser. There is a free version, limited to some geolocations from where you execute the scanner, but annoyingly it nags you to buy the product: