Stars - the number of stars that a project has on GitHub. Growth - month over month growth in stars.
Activity is a relative number indicating how actively a project is being developed. Recent commits have higher weight than older ones.
For example, an activity of 9.0 indicates that a project is amongst the top 10% of the most actively developed projects that we are tracking.
STklos
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Oldest Scheme Implementations
STklos was indeed born in 2001, but it was the successor of Stk, which is much older. Its first release was in 1993. As far as I know, STkos did use code from STk, so I'm not sure one couldn't say it was born in 1993, as "STk".
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Most readable Scheme implementation
That said, I'd just like to mention that I have made an effort to write internals documentation ( general: "hacking", bytecode: "vm") to STklos. It's an interesting implementation because it's easy to add primitives and change the compiler. The internals of the VM is actually a bit more complex... But it's really interesting code.
- STklos 1.70 was released
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August 2021 - What are you up to schemers ?
I've been working on enhancing STklos' macro system. The idea is to implement `syntax-case` properly and use it to obtain a better implementation of `syntax-rules` (the one in STklos is quite old and has some issues).
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STklos 1.60 released
SRFI 143 has already been accepted, and there are recent pull requests for 170, 215, 217! :)
Kawa
- Kawa
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Emacs-like editors written in Common Lisp
Kawa (like Clojure) runs on the JavaVM, but has a longer pedigree (from 1996), good compatibility with standard Scehemes (including R7RS), and has a stronger emphasis on performance: It has optional types and semi-decent type inferance so it is easy to write code as performant as Java. It also has fast startup, and is unopinonated on how you run and bundle applications: it generates pretty vanilla class files that interoperate with Java easily. See https://www.gnu.org/software/org and https://gitlab.com/kashell/Kawa
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Oldest Scheme Implementations
Kawa is quite relevant, and it seems that the project started in 1996. Still actively maintained.
What are some alternatives?
LIPS - Scheme based powerful lisp interpreter in JavaScript
drracket - DrRacket, IDE for Racket
ribbit - A small and portable Scheme implementation with AOT and incremental compilers that fits in 4K. It supports closures, tail calls, first-class continuations and a REPL.
sagittarius-scheme - A manual (beh...) clone from bitbucket to use hosted CI service which only support GitHub
guile-gi - Bindings for GObject Introspection and libgirepository for Guile
STk - STk is the ancestor of STklos (https://stklos.net) This repository contains fixes to allow the compilation of 4.0.1 on modern versions of GCC
cyclone - :cyclone: A brand-new compiler that allows practical application development using R7RS Scheme. We provide modern features and a stable system capable of generating fast native binaries.
CSCMIC - Learning to make a Scheme interpreter in C
husk-scheme - A full implementation of the Scheme programming language for the Haskell Platform.