XWiki is a WikiWiki clone written in Java that supports many popular features of other Wikis like the Wiki syntax, version control, attachments, security, and searching, but also many advanced features like templates, database and dynamic development using the velocity or groovy scripting language
... [More], a plugin system and skinability, J2EE scalability, XML/RPC remote API, Portlet integration, statistics, an RSS feed, PDF exporting, and WYSIWYG editing. [Less]
sMArTH is an online equation editor for MathML and LaTeX that is built on open Web standards. The editor itself uses a SVG interface and the application logic is implemented in ECMAScript using the DOM. Both MathML and LaTeX are supported as exporting formats in addition to the SVG format.