frevvo Live Formsâ„¢ Designer leverages Ajax technologies to create rich, dynamic forms without writing a single line of code. You can easily create amazing forms using just a web browser, and frevvo Live Formsâ„¢ Server brings a new level of functionality to browser-based forms such as sophisticated business rules, collaborative use and XML connectivity with your server applications.

Some of it's capabilities are:

1. XML aware forms.
2. Fancy layouts – collapsible sections, tabs ...
3. Dynamically repeating things – multiple cars, email addresses ...
4. Business rules – conditional sections, computed values ...
5. Complex validation – validate against a database or a complicated regex

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frevvo, Web 2.0, Live Web Forms Builder