MalbolgeLisp

Supports standard Lisp constructs like cond, let, and lambda, plus advanced features such as tacit programming and monad lifting, making it surprisingly expressive for an esoteric interpreter, as detailed in the README examples.

Implements a usable Lisp interpreter in Malbolge Unshackled—arguably the hardest programming language—demonstrating extreme programming skill and pushing the boundaries of esoteric language design, as noted in the project description.

Version 1.2 improved speed and reduced code size, evidenced by Fibonacci function execution times dropping from over a minute to 43 seconds for small inputs, per the README benchmarks.

Includes a detailed book on design and implementation, serving as a valuable resource for understanding Malbolge and constrained programming, beyond typical documentation.