Shen is a Lisp-family functional language that unifies pattern matching, macros, lazy evaluation, a sequent-calculus-based type system, embedded Prolog, and a compiler-compiler in one environment.

 Shen is a Lisp-family functional language that unifies pattern matching, macros, lazy evaluation, a sequent-calculus-based type system, embedded Prolog, and a compiler-compiler in one environment. Since 2021 it has converged on a lightweight S-series kernel featuring a partial-application core, typed YACC, GC’d Prolog, and packages/I/O/hash tables. Learn via “Shen in 15 minutes” and The Book of Shen. Distributions include the latest S-kernel, stdlib 2.x, Shen/tk (Tcl/Tk GUI), and Yggdrasil for stand-alone builds. In 2025 “Open Shen” offers extensive free materials. Shen runs on many host languages with cross-platform sources. With a REPL, type inference, pattern-oriented definitions, and abstractions for exceptions/streams/maps, its small core plus rich standard libs support DSL design, proof-flavored type checking, and mixing logic/functional/imperative styles. Yggdrasil enables single binaries, Shen/tk enables simple GUIs, and curated samples/tutorials help both research and production users seeking strong expressiveness in short code.


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