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Yeah, Marpa is quite amazing—it inspired me to build nearley. It's probably more powerful than any other parser generator out there right now (and the fastest, because it has Leo optimizations and Aycock-Horsepool nullables). In fact, Kegler responded to this same article with http://jeffreykegler.github.io/Ocean-of-Awareness-blog/indiv...

Seems to be written in C:

"Marpa is available as a open-source library. It is written in C, and the C library can be used directly or via a Perl interface."

http://jeffreykegler.github.io/Ocean-of-Awareness-blog/indiv...

Marpa's homepage: http://savage.net.au/Marpa.html