Has no IDE, working as library for other development tools. Supported development tools: FreePascal and Delphi/Kylix (also available as dynamic library).
Development tool vendor platform dependent. If the development tool is available on Linux then the output will run on Linux, etc.
Free open source framework.
Additional update: My personal opinion about the frameworks above…
IMHO, for a fully RAD framework, Morfik is the best. For Delphi/Kylix based framework, IntraWeb is the best. For non-visual web app framework (such as web service) then PWU is the best. Any other opinions upon this? 😉
The most disadvantages of each framework is… for Morfik, it has its own internal Apache web server so the output app can’t be used on currently available external web server. For IntraWeb, it very depends on Kylix and Delphi, so I think it’s not truly cross-platform. For PWU, it has no support for visual web app development especially for AJAX-based web app. Building a rich-client web app using PWU is indeed a hard work, at least for me.