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0boot

fast bootable Read Track/Sector routine (single)

4live

80columns

80x25 text mode for the Commodore 64 BASIC/KERNAL environment

a2audit

Apple II audit routines: for testing your Apple II or emulator

a2fc.system

a very small .a2fc graphics file viewer for Apple II computers

a2qr

acheronvm

Reconfigurable 16-bit Virtual CPU for 6502 computers

aes

AES-256 block cipher

anti-m

Boot any Apple II disk on any Apple II

ascii_b64

executable ASCII base64 decoder

atomchess-6502

Toledo Atomchess for Atari VCS/2600

bastoken

Tokenizer for AppleSoft BASIC

belt

Bel-T block cipher in x86 assembly

bin_b64

binary base64 decoder

blake2

BLAKE2 cryptographic hash

bogomandel

A silly toy Mandelbrot program for the BBC Micro.

bootos

bootOS is a monolithic operating system in 512 bytes of x86 machine code.

brainfuck

compiler for x86 in 100 bytes

brainfuck6502

interpreter for 6502 Apple II in 144 bytes

cadius

A maintained fork of BrutalDeluxe's Cadius ProDOS disk imaging utility (used for making Apple II disk images).

cc65

cc65 - a freeware C compiler for 6502 based systems

chacha

ChaCha20 stream cipher

cubicdoom

A ray-casting game in 512 bytes of x86 machine code

des

DES in C and x86 Assembly

directi-dos

Apple II Diversi-DOS direct to LC, in two tracks

dos33fsprogs

Tools for manipulating Apple II dos33 filesystems

echo

echo in 240 bytes (99% smaller) (x86)

fhpack

Compression for Apple II hi-res images

gimli

Gimli permutation function in C and x86 assembly

greenscale

low res monochrome experiments for Apple II