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r5rs-denot
A correct Scheme interpreter derived from the R5RS spec's formal semantics, written in Haskell.
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The Scheme dialect of Lisp is perhaps my favorite for how small the core is (and hygienic macros are an elegant solution to avoiding accidental captures). The R5RS language report also specifies the formal denotational semantics of the language. But it's also more precise than McCarthy's presentation, the denotational semantics can be easily turned into a real, correct-by-construction interpreter[0].
[0] https://github.com/siraben/r5rs-denot
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