Gotta love Parsec for Haskell and pyparsing for Python. Some other awesome parsing libs:

PEGTL - C++ Parsing Expression Grammar Template Library https://github.com/taocpp/PEGTL

Parboiled - Java & Scala PEG Library https://github.com/sirthias/parboiled

Nom - Rust parser combinator framework https://github.com/Geal/nom

Nearley - JavaScript parser toolkit https://github.com/Hardmath123/nearley

Neotoma - Erlang library and packrat parser-generator for PEGs https://github.com/seancribbs/neotoma