F-Script for Mac OS X
Preview : F-Script for Mac OS X -- "Developer Preview 2 released. FSWeb Released."
FScript is a scripting environment for Mac OS X, and now comes with a cool runtime object browser. There is extensive documentation available in PDF format.
FSWeb.fcgi allows you to use F-Script for web applications, and comes with a GUI development tool called FSWebBuilder.
Update: F-Script is very cool. The object browser is very cool.
FSWeb is an ASP/JSP type runtime for F-Script code. I'm not a fan of ASP/JSP, I avoid anything that embeds scripting directly in HTML pages. But if you like ASP/JSP, and find yourself liking F-Script, I'm sure you'll be happy that FSWeb is out there.