Bluish Coder: Javascript Parser Combinators
A javascript parser combinators

Cognition
Capability of parsing COinS

http://www.cs.ucla.edu/~awarth/ometa/
OMeta is a new object-oriented language for pattern matching. It is based on a variant of Parsing Expression Grammars (PEGs) which we have extended to handle arbitrary data types.

pyparsing
The pyparsing module is an alternative approach to creating and executing simple grammars, vs. the traditional lex/yacc approach, or the use of regular expressions. The pyparsing module provides a library of classes that client code uses to construct the...

Beautiful Soup: We called him Tortoise because he taught us.
You didn't write that awful page. You're just trying to get some data out of it. Right now, you don't really care what HTML is supposed to look like. Neither does this parser.

Spirit
Spirit is an object oriented recursive descent parser framework implemented using template meta-programming [1] techniques. Expression templates [2] allow us to approximate the syntax of Extended Backus Normal Form [3] (EBNF) completely in C++.

Magpie RSS - PHP RSS Parser
Magpie RSS - PHP RSS Parser

Clue: an ANSI C compiler targeting high level languages
Clue is an ANSI C compiler (C89, some C99) that targets high-level languages such as Lua, Javascript or Perl.

Comparison of parser generators - Wikipedia, the free encyclopedia
This is a list of notable parsing systems.

Operator-precedence parser - Wikipedia, the free encyclopedia
An operator precedence parser is a computer program that interprets an operator-precedence grammar.

Earley parser - Wikipedia, the free encyclopedia
The Earley parser is a type of chart parser mainly used for parsing in computational linguistics, named after its inventor, Jay Earley.

Preprocessor ABNF - MediaWiki
MediaWiki preprocessor syntax in ABNF

Ardekantur / Extending Ruby’s RSS Parser
interesting techniques for parsing tags