Scheme

scheme.org states the design rule rather than a feature list, and the sentence is the most quoted line in language design: “Programming languages should be designed not by piling feature on top of feature, but by removing the weaknesses and restrictions that make additional features appear necessary.” Everything on the site follows from taking that seriously — a minimal core, functional programming, and DSLs built on top rather than facilities built in.

T3 — a community hub, not a vendor or standards body, the same grade as common-lisp‘s lisp-lang.org and c‘s c-language.org.

Minimalism as the opposite bet from Common Lisp

Both are Lisps (lisp) and both make the language extensible. common-lisp sells that as room to add — CLOS, macro DSLs, a large standard called a rock-solid foundation. Scheme sells the same mechanism as permission to leave things out: if users can build the abstraction, the language does not need to ship it. One corpus, one family, two readings of what extensibility is for, and this is the cleanest opposed pair the spoke has.

A standard that is a series, and 20+ implementations

The site catalogs more than twenty Scheme systems and sorts them by which report they implement — compilers (Chez Scheme, CHICKEN, Racket), interpreters (Chibi-Scheme, Gauche, Guile), and host-targeted variants (Kawa on the JVM, JazzScheme for GUI work). Most support R7RS; several support R6RS.

That makes it the corpus’s best-documented case of the thing language-governance says committee governance buys: a language defined by a document, with implementations competing beneath it. c asserts this; Scheme’s site shows the table. And unlike Common Lisp’s single ANSI document, the Revised Reports are an ongoing series, so the same institutional form again produces a different temperament — see the tension flagged in synthesis between a standard as motion and a standard as ballast.

Kawa is worth marking on hosted-language: a Scheme on the JVM is the same move clojure made, made earlier and without the immutability commitments.

What the site is

A hub rather than a home page — learning material and a browser-based interpreter, the standards, the implementation catalog, community forums and mailing lists, Planet Scheme, a wiki, and shared infrastructure (Docker images, git hosting, CI). It carries no adoption numbers and no performance claims, which is unusual here and worth stating plainly: it is the only source in the corpus that sells nothing.

Related

lisp · common-lisp · clojure · language-governance · hosted-language · programming-language · synthesis