nathansobo/treetop

A Ruby-based parsing DSL based on parsing expression grammars.

cgrand/parsley

a DSL for creating total and truly incremental parsers in Clojure

sirthias/parboiled

Elegant parsing in Java and Scala - lightweight, easy-to-use, powerful.

textX/Arpeggio

Parser interpreter based on PEG grammars written in Python http://textx.github.io/Arpeggio/

blamario/grampa

Grammatical parsers - combinator library for parsing general context-free grammars

doctrine/lexer

Base library for a lexer that can be used in Top-Down, Recursive Descent Parsers.

ekmett/parsers

Generic parser combinators