Browse free open source Assembly Software Development Software and projects below. Use the toggles on the left to filter open source Assembly Software Development Software by OS, license, language, programming language, and project status.
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libjpeg-turbo is a JPEG image codec that uses SIMD instructions (MMX, SSE2, NEON, AltiVec) to accelerate baseline JPEG compression and decompression on x86, x86-64, ARM, and PowerPC systems. On such systems, libjpeg-turbo is generally 2-6x as fast as libjpeg, all else being equal. On other types of systems, libjpeg-turbo can still outperform libjpeg by a significant amount, by virtue of its highly-optimized Huffman coding routines. In many cases, the performance of libjpeg-turbo rivals that of proprietary high-speed JPEG codecs.
libjpeg-turbo implements both the traditional libjpeg API as well as the less powerful but more straightforward TurboJPEG API. libjpeg-turbo also features colorspace extensions that allow it to compress from/decompress to 32-bit and big-endian pixel buffers (RGBX, XBGR, etc.), as well as a full-featured Java interface.
The goal of the project is now to develop a user library called libpfm4 to help setup performance events for use with the perf_events Linux kernel interface. The development of the perfmon kernel subsystem, libpfm and pfmon has now stopped.
Open-source, free, multi-platform BASIC compiler, with syntax similar MS-QuickBASIC (including the GFX statements), that adds new features such as pointers, unsigned data types, inline assembly, a pre-processor and many others.
mcrypt, and the accompanying libmcrypt, are intended to be replacements for the old Unix crypt, except that they are under the GPL and support an ever-wider range of algorithms and modes.
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The "Open On-Chip Debugger" provides JTAG/SWD access from GDB (or directly with TCL scripts) to processors with ARM and MIPS based cores.
See website for full list of supported targets.
A disassembler for the linux platform. Currently this supports x86 ELF files assumed to be written in C and output to intel- syntax assembly language; however the design is modular and replacements for any of these can be written.
WinAVR (tm) is a suite of executable, open source software development tools for the Atmel AVR series of RISC microprocessors hosted on the Windows platform. Includes the GNU GCC compiler for C and C++.
This is NASM - the famous Netwide Assembler.
THIS PAGE IS OUT OF DATE; we no longer use any Sourceforge services other than mailing lists.
Get the current versions from http://www.nasm.us/.
CLISP is a portable ANSI Common Lisp implementation and development environment by Bruno Haible. Interpreter, compiler, debugger, CLOS, MOP, FFI, Unicode, sockets, CLX. UI in English, German, French, Spanish, Dutch, Russian, and Danish.
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Mikmod is a module player and library supporting many formats, including mod, s3m, it, and xm. Originally a player for MS-DOS, MikMod has been ported to other platforms, such as Unix, Macintosh, BeOS, and Java(!!)
Freemat is an interpreted, matrix-oriented development environment for engineering and scientific applications, similar to the commercial package MATLAB. Freemat provides visualization, image manipulation, and plotting as well as parallel programming.
libmng -THE reference library for reading, displaying, writing and examining Multiple-Image Network Graphics.
MNG is the animation extension to the popular PNG image-format.
A cross-platform x86 assembler with an Intel-like syntax
NASM (Netwide Assembler) is a widely used, open-source assembler for the x86 architecture that provides a flexible and portable way to write low-level machine code using an Intel-style syntax. It is designed to support a wide variety of output formats, making it suitable for different operating systems and development environments. NASM is known for its simplicity and clarity, allowing developers to write assembly code that is both readable and efficient. It is commonly used in system programming, operating system development, and performance-critical applications where direct hardware control is required. The assembler is highly portable and can be used across multiple platforms, making it a standard tool in many low-level programming workflows. Its maturity and widespread adoption have made it a reliable choice for developers working close to the hardware. Overall, nasm serves as a foundational tool for understanding and implementing low-level software systems.
Check yafu on github for the latest code.
YAFU (with assistance from other free software) uses the most powerful modern algorithms (and implementations of them) to factor input integers in a completely automated way. The automation within YAFU is state-of-the-art, combining factorization algorithms in an intelligent and adaptive methodology that minimizes the time to find the factors of arbitrary input integers. Most algorithm implementations are multi-threaded, allowing YAFU to fully utilize multi- or many-core processors (including SNFS, GNFS, SIQS, and ECM).
YAFU is primarily a command-line driven tool. You provide the number to factor and, via screen output and log files, YAFU will provide you the factors. There is also an interactive environment similar to MATLAB or PARI/GP, where you can type commands and store results. YAFU is very customizable, through the optional use of many many command line parameters and a very capable expression inter
AMX Mod X is a Metamod plugin which allows you to write modifications for Half-Life with Small scripting language. It provides in-game administration tools, game statistics, server management and gameplay modificators. It is based on the original AMX Mod
scmRTOS is tiny Real-Time Preemptive Operating System intended for use with Single-Chip Microcontrollers. scmRTOS is capable to run on small uCs with as little amount of RAM as 512 bytes. The RTOS is written on C++ and supports various platforms.
C/C++ compilers and tools to compile and build for targets
DOS 16/32-bit, RDOS, Windows 16/32-bit, OS/2 16/32 bit, Linux 32-bit (x86), Netware
running on host OS
DOS, Windows 16/32/64-bit, OS/2, Linux 32/64-bit (x86/x64)
Open Watcom is now completely moved to GitHub
Open Watcom 2.0
https://github.com/open-watcom/open-watcom-v2#open-watcom-v2-fork
Open Watcom 1.9
https://github.com/open-watcom/open-watcom-1.9
PICSimLab is a realtime emulator for PIC, Arduino, STM32, ESP32, ...
⚠️ Please note: The official distribution of the PICSimLab simulator binaries is available on github.com and SourceForge.net. Be cautious of unofficial sites, such as picsimlab.com, which do not disclose the owner.
PICSimLab is a realtime emulator of development boards with MPLABX/avr-gdb debugger integration. PICSimLab supports microcontrollers from picsim, simavr, uCsim, qemu-stm32, qemu-esp32, and gpsim. Using the PICSimLab Code Project Wizard, you can quickly create pre-configured code templates for both writing and debugging a wide range of boards. For boards based on the PIC16F and PIC18F microcontrollers, the wizard generates projects that utilize MPLAB X. For boards based on AVR, STM32, and ESP32, the wizard generates projects that utilize VSCode+PlatformIO.
PICSimLab supports several devices (spare parts) that can be connected to the boards for simulation. Such as example LEDs and push buttons for simple outputs and inputs and some more complex ones like the ethernet shield.
This repository contains the source files for the official RISC‑V Instruction Set Manual, including the Privileged RISC‑V Manual in LaTeX and the Unprivileged Manual in AsciiDoc. It tracks formal ratified versions of the ISA maintained by RISC‑V International and hosts build workflows for releasing updated ISA documents.
ChibiOS/RT is a free and efficient RTOS designed for deeply embedded applications. It offers a comprehensive set of kernel primitives and supports many architectures: ARM7, Cortex-M0, Cortex-M3, Cortex-M4, PowerPC e200z, STM8, AVR, MSP430, ColdFire, H8S, x86.
Original Apollo 11 Guidance Computer (AGC) source code
Apollo-11 hosts the original Apollo 11 Guidance Computer (AGC) source code for the Command Module and Lunar Module, faithfully transcribed from historical listings. It is written in AGC assembly and reflects 1960s software engineering practices, complete with comments from the original programmers. The code is both a cultural artifact and a technical reference, illustrating how limited memory and processor constraints shaped algorithms and system design. Developers can examine navigation routines, guidance logic, and task scheduling in an environment with no luxury features—everything is explicit and resource-aware. The repository’s structure and documentation make it approachable for modern readers despite the archaic environment. It’s frequently used in education, talks, and explorations of software history to show how a landmark mission depended on disciplined code and verification.
libunicows makes writing Unicode-enabled applications for Windows 9x a bit easier - it provides portable, compiler-independent import library that is needed if you want to use unicows.dll from MSLU, MS Unicode Layer for Windows 9x.
Microsoft BASIC for 6502 is the original assembly-language source code for Microsoft’s BASIC interpreter version 1.1, written for the MOS Technology 6502 8-bit microprocessor back in the late 1970s. It was used on pioneering personal computers (such as the Apple II, Commodore PET, etc.), enabling users to write and run programs in BASIC on those systems. The repo contains the full source (in 6502 assembly), with support for multiple hardware platforms via conditionals, includes floating-point arithmetic, string handling, arrays, math functions, I/O, etc. The repository is maintained by Microsoft, is archived (read-only), and released under the MIT license.
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