" a simple parser generator for JavaScript that produces fast parsers with excellent error rporting. You can use it to process complex data or computer languages and build transformers, interpreters, compilers and other tools easily"

An introductory use of Scala's parser combinator. Terse, but an unpleasant use of peculiar operators for brevity.

"Ragel is a very powerful state machine compiler and parser generator"

A ruby/python based HTML parser/tokenizer based on the WHATWG HTML5 specification for maximum compatibility with major desktop web browsers.

Another way to parse and build RSS feeds in Ruby.

a Pythonic binding for the libxml2 and libxslt libraries

this is like the textual equivalent of the Penny Arcade podcast for language geeks: listening in to the successes and failures and snide asides while witnessing something casually brilliant.