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Altirra The best, most polished and complete emulator for Atari 8-bit systems
Atari800Win Plus Excellent emulator for Atari 8-bit home computer systems
Atari800 Excellent, portable emulator for Atari 8-bit home computer systems
Atari++ A Unix and Win32 based emulator of the Atari eight bit computers, namely the Atari 400 and 800, the Atari 400XL, 800XL and 130XE, and the Atari 5200 game console. The emulator is auto-configurable and will compile on a variety of systems (Win32, Linux, Solaris, Irix).
Xformer 2000 Obsolete, but good emulator for Atari 8-bit home computer systems. Author of this emulator also owns original ROM images, usable for other Atari emulators.
Atari800MacX Macintosh OS X Port of David Firth's Fantastic Atari 800 Emulator
A8E A8E is a freeware Atari 800 XL emulator. It uses the SDL library for the user interface and the audio and graphics (via OpenGL) output.

Development tools
Mads Assembler MADS is a multi-pass crossassembler designed for 6502 and 65816 processors. Binaries are generated mainly for Atari 8-bit systems (supported are AtariDosII and SpartaDOS X formats).
Mad Pascal Compiler Great new cross development system for 6502 microprocessor by Tebe, resembling Pascal, specifically made for Atari home computers. It is based on Sub-Pascal 32-bit real mode compiler for 80386+ processors v. 2.0 by Vasiliy Tereshkov, 2009
xasm A freeware 6502 cross-assembler Windows with original syntax extensions. It is mainly targeted at Atari 8-bit computers, but it can be also used for programming Atari 2600/5200/Lynx, Commodore C64, Apple ][ and others.
FastBasic This is a fast interpreter for the BASIC language on the Atari 8-bit computers. A cross-compiler is available that directly compiles sources to Atari executables in any modern PC.
cc65 cc65 is a complete cross development package for 65(C)02 systems, including a powerful macro assembler, a C compiler, linker, librarian and several other tools. It is based on a C compiler that was originally adapted for the Atari 8bit computers by John R. Dunning.
ATasm A 6502 command-line cross-assembler that is compatible with the original Mac/65 macro assembler released by OSS software. The aim of ATasm is to provide Atari home-brew coders with a comfortable and powerful toolset.
Atalan A new high level programming language for MOS Technology 6502 microprocessors. It is meant to be used for development on 8bit computers like Atari 800, C64 etc. A work in progress!
Action Compiler Recreating the Action! compiler for the Atari Computer and the 6502
Effectus Cross compiler for Action! programming language using MADS assembler. My project in progress!
TurboBasic XL parser tool This program parses and tokenizes a TurboBasic XL listing in a flexible format and produces any of three different outputs
Interactive 6502 Disassembler for Win32 Interactive 6502 disassembler for Atari binary files on Windows.

Graph2Font The Graph2Font (G2F) program treats the image as fields with dimensions of 4x8, 2x8, 8x8 pixels. At the beginning this program had been used only to convert graphics to chars but now it also allows you to do multicolor graphics for the 8-bit Atari.
Atari Interlace Studio Excellent graphics manipulation program for most Atari 8-bit Atari graphics formats by Tomasz "TeBe" Biela.
RECOIL - Retro Computer Image Library RECOIL is a viewer of pictures in native formats of Amiga, Atari 8-bit, Atari Portfolio, Atari ST, Atari Falcon, Commodore 64, Macintosh 128K, MSX, SAM Coupé and ZX Spectrum computers.
Atari FontMaker Excellent font editing program similar to EnvisionPC program in features
EnvisionPC A font/map editing program similar to the old Envision program on the Atari
PicMixer Small graphics utility for creating graphics dump of selected Windows screen section

RASTER Music Tracker RASTER Music Tracker (RMT) is a cross-platform tool for making Atari XE/XL music on PC (OS Win9x).
ASAP - Another Slight Atari Player ASAP is a player/converter of Atari 8-bit music for modern computers. It provides high-quality, identical to the popular Atari800 emulator, emulation of the POKEY sound chip and the 6502 processor.
mmSAP mmSAP is comfortable SAP player for GNU/Linux with GTK+ GUI and fully featured playlist. Have fun with eight POKEY channel visualization toolbars. Get all advantages of precise POKEY emulation with libSAP-2.0
Atari SAP players The Atari SAP Music Archive players
Atari SAP tools The Atari SAP Music Archive tools

Disk tools
Total Commander ATR plug-in ATR plugin for Total Commander by Pajero/MadTeam: - supports 99% of the following DOS structures: Atari Dos - Dos2, DosII, MyDos, Sparta Dos and BW-Dos, and more...
AtariDsk AtariDsk is a program for MSDOS-PCs that allows you to access Atari floppy disks in double density (180k). All you need is a PC (XT or 286 should be sufficient) and a 5.25" floppy drive.
WriteAtr With WriteAtr you can write double density ATR-images to Atari floppy disks on your MSDOS-PC. You can also create ATR-images of double density floppy disks! All you need is a PC and a 5.25" and/or a 3.5" floppy drive.
ATADIM A small PC (Win9x) tool for easy work with Atari disk image files XFD and ATR.

Misc utilities
Omnivore It is a cross-platform app for modern hardware (running Linux, OS X and Windows) to work with executables or disk images of Atari 8-bit machines. It is a hex editor, a disassembler (with mini-assembler) and a map editor.
AtariTools-800 Windows toolkit dedicated to ATARI 400/800/XL/XE/5200/XEGS. It includes Char-Editor/Char-Animator/PM Editor/DL Editor/GR Editor
Atari MapMaker Windows map creation tool for ATARI XL/XE games.
Memo Pad It allow Windows users to read ATASCII files. It displays the files using the same font used on the Atari 8-bit computers. Memo Pad can also display ASCII files that contain a common end-of-line character.
Super Packer Excellent tool for packing and extracting DOS files with ability to mark segment to work on.
AAC (ASCII ATASCII Converter) A program for converting ASCII and ATASCII files
Atari Player Editor This is web-based utility for 8-bit Atari, which helps you design players (sprites)
Creaxin1 Creaxin1 is new freeware tool for IBM/PC with OS Win9x. It make possible to create package of Atari programs/games, which will be stored in S/XEGS RAMcart 128KB by C.P.U.
AtasciiPad Small and very useful utility for creating and editing Atari screens with the feature of creating native Atari executable file from created screen. Also, you have the ability to view and edit Atari BASIC files by dragging onto the program panel in *.BAS viewer tab.
Dratex A small PC (Win9x) tool - converter from among character set layouts. It supports most used Czech layouts: Windows1250, ISO8859-2, Kamenicky, standard ASCII, Atari Czech layouts Capek, Tcheko and standard ATASCII.
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