the most customizable portal: full i18n localization support; OS, web server, database independent; output: XHTML, PDF, RSS, TXT, RTF, WML, and more...
WebGate is a web application that aggregates frequently used content into one location. It's written in Java/XML/XSLT and can be used for web based email, a complete TV grid, RSS/RDF feed reader, integrated searching (dictionary, google, imdb), etc.
Java API for creating Rich Site Summary (RSS) feed files. Created for people who want to create RSS files from within their applications but don't want to get into the nitty gritty of working out XML specs.