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URL:http://brycec.github.com/vizlamb/
This is a universal machine, using the untyped lambda calculus, visualized as a tree with d3.js. # is an abstraction. @ is application. Numbers are variables.
The syntax is a simplified version of the De Brujin index, meaning vars match to their Nth parent lambda (#), N being the var name. It requires explicit applications, ie you can't drop parens.
It gets parsed by a parser generated by PEG.js. Grammar and source on github.