There are 9 repositories under atari-st topic.
A latency-hating emulator of: the Acorn Electron 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.
A large repository of Atari ST (and family) source code
RetroTxt is the WebExtension that turns ANSI, ASCII, NFO text into web documents.
Free open-source compressor for apLib with 5-7% better ratios
Gridrunner (1982) by Jeff Minter
A free, open-source compressor for the ZX0 format
volksFORTH is a 16bit Forth System maintained by the German Forth Gesellschaft e.V.
Floppy disk emulator for old computers and machines, Amiga, Atari ST, etc.
Enhancements to the Atari ST version of Lotus Esprit Turbo Challenge to support STE hardware features
Windows package to mount disk images and real floppy drives for non standard windows file systems
68000 assembly tutorials for Atari ST by perihelion of poSTmortem
A multiplatform command line application to query csv files using a sql like syntax
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.
A few libs, including a lot of Commodore / CSG parts
Solution for multisync switch for Atari ST/STE.
GCC toolchain for Motorola 68000
Atari ST version of the replay source for Arkos Tracker 2 (http://www.julien-nevo.com/arkostracker/)
A virtual Atari ST disk over serial for Windows, Linux and macOS
WASD-style joystick for vintage computers. With an added Arduino Pro Micro you can use it as a USB-keyboard, so if you wanted a DIY streamdeck or Macro-keyboard - then the C64 JoyKEY can do that as well.
Pixel font based on Atari ASCII and Atari ST characters
A collection of ansible playbooks to build the ST Mint distribution