DotWeb is a PHP library for handling HTML controls which is very similar to .NETs Webforms. Visit http://www.gotmono.com/docs/aspnet/htmlcontrols.html for more information.
Pieforms provides a simple, unified way to create, validate and process forms all with a common look and feel, with support for pluggable elements, renderers and validation rules. Supports AJAX submission, date picker/other advanced controls. PHP5+.