Open Source MS-DOS System Software

Info-ZIP portable compression/archiver utilities (Zip, UnZip, WiZ, etc.)

System Informer is a free and open source process viewer. This multi-purpose tool will assist you with debugging, malware detection and system monitoring.

Professional System Information and Diagnostics. Comprehensive Hardware Analysis, Monitoring and Reporting for Windows and DOS. HWiNFO is an all-in-one solution for hardware analysis and monitoring supporting a broad range of OSes (DOS, Microsoft Windows 95 - Windows 11, WinPE) and platforms (i8086 - Xeon Platinum). Exhausting information about hardware components displayed in hierarchy unfolding into deep details. Useful for obtaining a detailed hardware inventory report or checking of various hardware-related parameters. Real-time monitoring of a variety of system and hardware parameters covering CPUs, GPUs, mainboards, drives, peripherals, etc. Useful for detection of overheating, overload, performance loss or failure prediction. Full hardware hierarchy, or quick summary overview. Export into XML, CSV, HTML reports. System monitoring in customizable tables, graphs, tray icons, OSD.

VICE is an emulator collection which emulates the C64, the C64-DTV, the C128, the VIC20, practically all PET models, the PLUS4 and the CBM-II (aka C610). It runs on Unix, MS-DOS, Win32, OS/2, Acorn RISC OS, BeOS, QNX 6.x, Amiga, GP2X or Mac OS X machines.

GRUB for DOS is the dos extension of GRUB. It enables dos users to run the configuration console directly in real mode. The project also contains an utility called WINGRUB, an GUI intends to help configuring and installing GRUB in the WINDOWS environment

ZSNES is a SNES/Super Famicom emulator for x86 computers. It runs on Windows, MS-DOS and Linux/FreeBSD and supports mode 7, sound, Super FX, and a lot more.

RetroArch is a way to run classic games on a wide assortment of Operating Systems and Consoles. Support the Developers on their Patron! https://www.patreon.com/libretro

Moved to https://atari800.github.io/

FreeDOS is an open source DOS-compatible operating system that you can use to play classic DOS games, run legacy business software, or write new DOS programs. Any program that works on MS-DOS should also run on FreeDOS.

uCON64 is a tool to backup all kinds of video games. It supports almost every available backup unit for cartridge-based consoles and performs many other tasks like ROM hacking.

IMPORTANT NEWS: UPX has moved to GitHub https://upx.github.io ========================

A portable version of the ARJ archiver, available for a growing number of DOS-like and UNIX-like platforms on a variety of architectures.

The Doszip Commander is an LFN-aware TUI file manager (NC clone) with built-in Zip and UnZip for DOS and Windows.

A MAME and MESS port with an advanced video support for Arcade Monitors, TVs, and PC Monitors. It also contains a bootable Linux LiveCD/USB, a frontend with animated MNG/MP3 snapshots, a rom manager, and recompression utilities for compressed files.

Smart BootManager is an os independent BootManager which has easy to use interface and many other features. The main goals of SBM are to be absolutely OS independent, flexible and full-featured. It has all of the features needed to boot a variety of OS.

O2EM is an open source multi-platform Odyssey2 / Videopac+ emulator. The Odyssey2 (Videopac/Jopac in Europe) was a video game console created in the late 70s.

DOS/32 Advanced DOS Extender is a drop-in replacement for the DOS/4GW DOS Extender and compatibles. Being fast, small and flexible DOS/32A can be used in many environments, from embedded systems to DOS emulators, by both developers and end users alike.

BitVisor is a tiny hypervisor initially designed for mediating I/O access from a single guest OS. Its implementation is mature enough to run Windows and Linux, and can be used as a generic platform for various research and development projects.

This is HimemX - the open-source XMS memory manager of FreeDOS. Uses unreal mode when possible and has a very low conventional memory footprint. Got any patches? Noticed any bugs? Please report your findings on the FreeDOS mailing list: freedos-user@lists.sourceforge.net

This is an insultingly simple project. It's just one file, existential.exe. It's 6 KB in size, has no dependencies or external libraries, and does absolutely nothing whatsoever. So if you need a dummy Windows executable, here ya go.

CuteMouse is a DOS based mouse driver, fully written in assembly language. It's optimized for size (and speed) to allocate as small as possible amount of your precious 640KB RAM. It currently supports serial and PS/2 mice and, if BIOS support present an

Wcd is another Norton Change Directory (NCD) clone. Wcd is a command-line program to change directory fast. It includes a full screen interactive directory tree browser with speed search and a fast way to choose between multiple matches.

This software boots your PC and analyse your filesystems. It displays a graphical menu for you to select which system to boot. Intended to replace LILO and Loadlin, written in C with GCC, fully real mode.

Teo is an emulator of the Thomson TO8 microcomputer for PC, running on MSDOS, Windows and Linux. The compatibility is close to 100% for softwares which don't use non emulated peripherals and don't hold physical protections. In other words, if a software doesn't work on Teo, so probably : 1. it needs the presence of another peripheral than mouse, light-pen, joystick, tape recorder and disks (so it won't run as long as this peripheral is not emulated), 2. its physical protection makes it fail.

uHex is a simple and fast, multiplatform hex editor. It's primarily written for DOS, but compiles on POSIX just as well. uHex has been written with care to work fast even on an 8086 CPU, providing support for large files (up to 2 GiB) while using minimal amounts of memory. "uHex" stands for "micro Hex" (it should actually be spelled µHex, but DOS operating systems do not allow non-ASCII symbols in filenames, thus the official name became just "uHex"). uHex supports several video text modes (80x25, 80x43, 80x50.. and any other, as long as it has at least 80 columns), both in color and black & white modes. Hardware requirements (DOS version) uHex has very low requirements. It runs on anything that provides: - an 8086/8088 compatible CPU, - a MS-DOS 2.0 compatible operating system, - ca. 20K of free conventional memory, - an 80 columns video mode.