Forms for Metadot Web Portal is a web based forms package for the metadot portal. From your browser you can define a form with checkboxes, radio buttons, etc. Validate minimum length, max size, or against a regexp, attach "help" to field, and usual forms package type stuff. Users can then use the web to enter data according to your forms. It works within the metadot portal environment (nice, flexible portal - gpl mod_perl mysql).
Linux SQL - All Revved Up, with no where to go.
While there are many enigines for Linux, form packages are few and far between, and web based forms packages even rarer.
An engine is necessary, but you need car to put it in. I've probably missed some great package out there, but it seem to me SQL on Linux is sorely lacking any decent forms packages.