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A heavily optimizing Brain**** interpreter written in Bash!
It's an interesting/challenging exercise to work through implementing some basic functions in BF, ie thinking only in loops.
I implemented an optimizing interpreter in Bash on a plane ride, and it's still one of my favorite pet projects.
BrainFuck interpreter and optimizing JIT compiler
TestGPT | Generating meaningful tests for busy devs. Get non-trivial tests (and trivial, too!) suggested right inside your IDE, so you can code smart, create more value, and stay confident when you push.
Fast brainfuck interpreter in C (by siraben)
Brainfuck makes it very easy to benchmark various optimizations that you can do to its interpreter. Rendering a Mandelbrot set goes from 28.57 to 6.49 seconds with basic preprocessing!
An uroboros program with 100+ programming languages
Quine relay  is to this day the most "I will never understand this" brainfuck project I have ever seen.
I developed a faster Ruby interpreter
1 project | news.ycombinator.com | 10 May 2023
Are there smaller Clojure-esque Lisps available ?
3 projects | reddit.com/r/lisp | 31 Mar 2023
Better C Generics: The Extendible _Generic
9 projects | reddit.com/r/C_Programming | 28 Jan 2023
Picol, a Tcl interpreter in 550 lines of C code
3 projects | news.ycombinator.com | 12 Dec 2022
Dictu Programming Lanugage
2 projects | news.ycombinator.com | 8 Nov 2022