Lambdascope, an optimal evaluator of the lambda calculus, as an interactive graph-rewriting system http://rochel.info/#graph-rewriting
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Lambdascope is an optimal evaluator of the λβ-calculus described in the paper "Lambdascope - Another optimal implementation of the lambda-calculus" by Vincent van Oostrom, Kees-Jan van de Looij, and Marijn Zwitserlood. Call "lambdascope" with one of the files from the "examples" directory as an argument. For usage of the GUI see
GraphRewriting.GL.UI. Use the "--lmo" flag for leftmost outermost evalution and "--bench" for non-graphical evaluation to weak head normal form.