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This project provides customization of XML editors to support publicly availble SGML and XML DTDs in particular those of the MSR-MEDOC project. While starting with XMETAL (aka xmetal) other systems are welcome.
jsBison is a parser generator which can read bison style grammar definitions and generates according parsers written solely in javascript. Therefore, using jsBison it is easily possible to perform "real" parsing on websites on the client side.
GenesisCode is a project to create a complete developing environment, where your current knowledge is enough, as long that you know what happens when you click save.
PHP framework with support for simple tags and server-side events like jsp, asp.net, etc. prioritizing separation between structure, behavior and presentation, generating clean valid html markup.