A latency-hating emulator of: the Acorn Electron, BBC Micro and Archimedes, Amstrad CPC, Apple II/II+/IIe and early Macintosh, Atari 2600 and ST, ColecoVision, Enterprise 64/128, Commodore Vic-20 and Amiga, MSX 1/2, Oric 1/Atmos, early PC compatibles, Sega Master System, Sinclair ZX80/81 and ZX Spectrum.

Emulates Mac Plus, PC, & Atari ST in the browser using WebAssembly

A large repository of Atari ST (and family) source code

EmuTOS is a Free operating system for Atari ST computers, and more.

Atari STE MiSTery core for the Tang Nano FPGAs

Unix-like kernel for Atari ST and compatible computers

RetroTxt is the WebExtension that turns ANSI, ASCII, NFO text into web documents.

The Atari ST, STE, TT and Falcon emulator. This is a mirror repository, the official one can be found on https://www.hatari-emu.org/ . Do NOT open pull requests here! Send patches to the hatari-devel mailing list instead.

Free open-source compressor for apLib with 5-7% better ratios

A free, open-source compressor for the ZX0 format

A port of the Atari ST game SunDog: Frozen Legacy (1984) by FTL software

volksFORTH is a 16bit Forth System maintained by the German Forth Gesellschaft e.V.

Gridrunner (1982) by Jeff Minter

Windows package to mount disk images and real floppy drives for non standard windows file systems

Floppy disk emulator for old computers and machines, Amiga, Atari ST, etc.

Peasauce Interactive Disassembler

small footprint C standard library for Atari ST and m68k-atari-mint cross compiler toolchain

MT32-PI.EXE/MT32-PI.TTP/mt32-pi-ctl is a control program for the mt32-pi MIDI synthesizer available for DOS PCs, Atari ST and Amiga computers as well as modern systems running Linux and Windows.

Historical source code and documents related to Amberstar, the role-playing game developed by Thalion Software GmbH, and published for the Atari ST in 1992.

Open Kick-Off is a fun rewriting attempt of the cult football game Kick Off 2 designed by Dino Dini and released in 1990 by Anco for the Atari ST and the Commodore Amiga. It is written in Java with the help of libGDX.

GCC toolchain for Motorola 68000

Atari ST/STe core for FPGAs

68000 assembly tutorials for Atari ST by perihelion of poSTmortem

Cycle-accurate YM2149 PSG emulator with real-time audio playback and visualization. Includes a Bevy plugin for easy integration into game engines and creative projects. Supports SNDH, GIST, Arkos-Tracker 2/3 & YM2-YM6 and AY formats with drag-and-drop file loading.

Enhancements to the Atari ST version of Lotus Esprit Turbo Challenge to support STE hardware features

PSG play chip music player for the Atari ST programmable sound generator (PSG) YM2149

An experimental VoxelSpace engine for the Atari ST

Library for creating Atari ST software

A multiplatform command line application to query csv files using a sql like syntax

Various AtariST/STE stuff