Calysto Scheme is a sophisticated Scheme interpreter implemented in Python that integrates with Jupyter notebooks. It features a multi-stage compilation pipeline (CPS → DS → RM → Python) with JIT compilation, continuation support (call/cc), and seamless Python interoperability. The system includes advanced optimizations like persistent vectors for O(1) lexical address lookup, epoch-based cache invalidation, and escape analysis for JIT inlining. It's used in educational contexts and provides debugging tools like a stepper-debugger, making it both a practical development tool and a platform for teaching programming language concepts.