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See https://github.com/sitefusion
SiteFusion is a server-based development environment. Applications are written in PHP and work through a thin XUL client. SiteFusion applications look and behave like native system applications but run on a server generating JavaScript commands.
...The script uses a .xml-file
to provide status changes for all kinds of web-pages. the code was
written mainly as a "proof-of-concept", but should provide a good starting
point for extensions.
IAPlatform is a base PHP framework nesting many other internet applications (as eXtensions), enabling interaction with them and bringing a whole new content management system. IAP is written in object-oriented PHP and uses SQL and XML as data sources.