Archetypes is a framework for developing new content types in Plone. The power of Archetypes is first in automatically generating forms, second in providing a library of stock field types, form widgets, and field validators, third in easily integrating custom fields, widgets, and validators, and fourth in automating transformations of rich content.
LGI is a lightweight GUI library and application framework. It supports cross-platform widgets, threads, Unicode, a multi-language resource file in XML (with graphical editor), drag and drop, common dialogs, network support with implementations of common protocols, and an HTML control.
The XView4Struts project is an extension to the Jakarta Struts Framework. Its main purpose is to eliminate the need to use tag libraries and JSP pages. The view is pure HTML, and interaction between the view and the model is transparent to the developer. This approach offers faster development, better division of work, a more pure MVC design pattern, reusable view components, and easier maintenance.