MagpieRSS provides an XML-based (expat) RSS parser in PHP.
MagpieRSS is compatible with RSS 0.9 through RSS 1.0. Also parses RSS 1.0's modules, RSS 2.0, and Atom. (with a few exceptions).
The ANTLR 3 Eclipse Plugin helps you develop ANTLR 3 grammars inside Eclipse. It currently provides a project nature, a label decorator, a builder, and problem markers for ANTLR errors.