Payment integration is one of the neater aspects of all three of these tools. JotForm, for instance, supports six different payment mechanisms, including PayPal, Google Checkout, and ClickBank. Once someone fills out a form, they are forwarded to the payment gateway. The money received shows up in the same table as the information from the form. This is a simple way to take prepayment for events.
While all of these systems are meant to be glorified form processors, they can be surprisingly useful if you're willing to adapt. Most interaction on corporate Web sites involves pure data entry, and that's all these tools do. Programmers might laugh that JotForm categorizes adding a star rating as a "Power Tool," but these form processors aren't playing to fancy programmers. They're looking for business folks tired of hoping programmers will answer their e-mail.