Open-source alternatives to Assembler Simulator

SASM is a cross-platform integrated development environment for writing, assembling, and debugging low-level assembly code. It serves as a unified editor and execution flow for assembly language development across different operating systems. The environment supports multiple assembly languages and their respective toolchains, including NASM, MASM, GAS, and FASM, within a single interface. It features a binary-level debugger that allows for stepping through instructions and inspecting CPU registers and variable states. The project provides a toolchain-based build pipeline and a configuration

This project is a comprehensive educational framework designed to guide learners through the complexities of systems engineering and low-level software development. It provides structured learning paths that integrate hardware simulation, source code analysis, and project-based exercises to help developers master the foundational concepts of computer architecture, operating systems, and firmware design. The curriculum distinguishes itself by emphasizing direct interaction with system internals, requiring learners to examine and modify existing open-source kernel and driver implementations. By

This project is an ARMv8 assembly programming guide and tutorial designed to teach the translation of high-level logic into low-level machine instructions. It serves as a low-level systems programming reference for writing and executing code specifically for the ARMv8 architecture. The resource provides instructions for cross-platform assembly implementation, focusing on unifying symbol naming and memory addressing to ensure source code builds across different operating systems. It also covers the integration of assembly routines with higher-level languages using standardized calling conventi

XiangShan is a high-performance RISC-V processor core and a hardware description language framework. It provides a construction-based system for designing, simulating, and verifying complex processor micro-architectures and peripheral devices. The project includes a high-performance CPU simulator used for architectural exploration and functional verification of processor execution. The project implements a superscalar out-of-order CPU architecture that uses renaming and reorder buffers to execute instructions in parallel. It generates synthesizable Verilog files from hardware descriptions to

This project is an educational curriculum designed to teach the fundamentals of operating system development and low-level systems programming. It provides a structured sequence of lessons and code samples that guide users through building a functional kernel and bootloader from scratch, enabling a practical understanding of how software interacts directly with computer hardware. The repository distinguishes itself by focusing on the core mechanics of bare-metal execution. It covers the implementation of essential system components, including assembly-based bootloaders that transition process

Bitwise is a computer architecture education kit and a comprehensive set of guides for building a custom CPU, operating system, and compiler from scratch. It serves as a CPU design tutorial and a practical framework for implementing a unique instruction set architecture. The project provides a custom instruction set architecture toolchain, including resources for creating a matching assembler and compiler. It further includes a hardware development guide for synthesizing computer components and peripheral controllers for deployment on programmable logic devices and FPGAs. The kit covers full

This project serves as an educational resource for learning and implementing low-level assembly language optimizations. It provides a structured guide for developers to master hardware-specific instructions and manual performance tuning, focusing on the translation of high-level code into efficient machine-level operations for resource-constrained environments. The materials emphasize techniques for maximizing computational throughput in multimedia processing. By covering instruction-level parallelism, register management, and data parallelism, the project enables the development of software

BlocksKit is a low-level utility library for Apple platform development, specifically designed for managing the execution flow and memory of blocks within macOS and iOS applications. It provides a collection of helper functions to simplify the use of blocks in Objective-C and C, reducing boilerplate code and addressing inherent technical limitations. The library focuses on bridging Objective-C blocks with legacy C-based APIs by providing compatible wrapper structures and function-pointer emulation. It enables the passing of blocks through system interfaces that require strict C-style callback

HelloSilicon is a programming guide and tutorial for writing and debugging low-level 64-bit assembly code specifically for Apple Silicon processors. It serves as an architecture reference for interacting with macOS and iOS kernel services using system calls and hardware registers. The project provides specialized instruction on foreign function interfacing to bridge assembly with high-level languages like C or Python. It also includes a toolkit for configuring Mach-O binaries and compiling universal binaries and dynamic libraries for cross-hardware compatibility. The material covers low-leve

asm-dude is a Visual Studio extension designed for assembly language development and low-level programming. It provides syntax highlighting, code completion, and mnemonic references for both source and disassembly windows. The plugin features a mnemonic reference tool that displays pop-up descriptions and parameter signatures for assembly instructions. These references are managed via configurable data files, allowing for customized instruction entries and descriptions. The extension integrates with the editor to provide context-aware tooltips and keyword completion during typing. It also em

vue-resource is a network library for making asynchronous HTTP requests and synchronizing remote server data with Vue.js application state. It functions as a REST API client for exchanging data between a web browser and a server using standard RESTful protocols. The library features a pipeline for modifying outgoing network requests and incoming responses to handle authentication and global error logging. It acts as an asynchronous data fetcher that retrieves remote resources and automatically updates the user interface when server responses arrive. The project provides an adapter-based tran

Orbit is a set of specialized tools for C and C++ performance profiling, binary symbol mapping, and remote process and thread analysis. It provides a system for analyzing execution time and resource usage, utilizing a call graph visualizer to map function entries and exits into hierarchical execution flows for individual threads. The project distinguishes itself with a remote process profiler capable of capturing performance data from applications running on remote hosts. It also includes a thread scheduling analyzer that tracks context switches and processor core utilization to visualize thr

This project is a collection of minimal operating systems, bootloaders, and hardware drivers used to demonstrate low-level x86 system programming and hardware interfacing. It serves as a kernel development toolkit and a system programming lab designed for testing architecture concepts and hardware behavior within a system emulator. The repository provides reference implementations for creating bootable disk images and loading kernel stages. It includes guides for implementing protected mode transitions, memory paging, interrupt descriptor tables, and symmetric multiprocessing on x86 hardware.

Opentui is a terminal user interface framework for building interactive command line applications. It provides a component-based system featuring a flexbox layout engine, a virtual node component tree, and a low-level 2D cell array renderer. The project is distinguished by a sophisticated keyboard binding engine that maps complex multi-stroke sequences and chords to named commands using prioritized, reactive layers. It also implements a plugin architecture that allows external modules to inject custom UI components into designated layout slots and extend input logic at runtime. Its capabilit

NuttX is a POSIX-compliant real-time operating system designed for microcontrollers ranging from 8-bit to 64-bit architectures. It provides a deterministic execution environment with a real-time task scheduler and a POSIX embedded kernel to ensure portable code execution across diverse hardware targets. The project distinguishes itself through a comprehensive hardware abstraction layer that provides standardized drivers for I2C, SPI, CAN, and USB across various semiconductor chipsets. It also features an embedded networking stack supporting TCP, UDP, IPv4, and IPv6, alongside industrial proto

Seer is a graphical frontend for GDB that provides a visual interface for inspecting variables, managing breakpoints, and stepping through code. It functions as a low-level debugger visualizer with specialized tools for call stack inspection and register visualization. The project distinguishes itself by integrating low-level program analysis directly into the visual experience, featuring a synchronized assembly overlay that maps CPU registers and assembly instructions to source code lines. It also includes memory bug detection capabilities by randomizing the program starting address during t

Zag is a headless UI state machine library that provides unstyled component logic to ensure consistent behavior across different rendering engines. It functions as a toolkit for modeling complex user interface interactions using statecharts, decoupling the underlying logic and accessibility attributes from visual styling. The library is framework-agnostic, utilizing specialized adapters to bridge its state machine logic with various JavaScript libraries such as React, Solid, Vue, and Svelte. This approach allows developers to maintain a single interaction model while applying any CSS or styli

Chips is a modular, header-only C library framework designed for building cycle-accurate hardware simulators and replicating historical eight-bit computing architectures. It provides the foundational components necessary to construct complete vintage systems by integrating individual emulated microprocessors and peripheral chips. The framework distinguishes itself through a component-based architecture where hardware modules are implemented as standalone headers that can be wired together to form complex systems. It models hardware interactions at a low level, utilizing pin-level signal emula

This project is an educational framework and toolkit designed for developing and testing operating system kernels. It provides a structured environment for implementing fundamental system primitives, including virtual memory management, preemptive process scheduling, and filesystem organization, using Rust and C. The framework is specifically oriented toward RISC-V and x86 architectures, serving as a laboratory for learning how to build core system software from the ground up. The project distinguishes itself by supporting both bare-metal deployment and hardware emulation, allowing developers

iOS-Runtime-Headers is a collection of Objective-C header files and tooling used to expose private and undocumented iOS system APIs. These definitions are generated through runtime introspection of the live operating system to uncover hidden class methods and properties. The project enables the use of undocumented iOS API definitions for internal Apple frameworks. It provides the necessary header files to allow a compiler to link against private system symbols and verify types for undocumented system calls. The tooling covers several technical areas, including memory-mapped metadata extracti

Asterinas is a memory-safe operating system kernel designed to prevent data races and memory corruption. It functions as a Linux-ABI compatible kernel, enabling the execution of existing Linux binaries and container workloads while providing a declarative operating system distribution model. The project distinguishes itself by acting as a virtual machine container host and a confidential computing guest OS, allowing it to run within hardware-isolated Trusted Execution Environments such as Intel TDX. It implements a minimal trusted computing base by isolating unsafe low-level operations and se

This project is a comprehensive technical guide to advanced Go programming. It serves as a programming guide, technical reference, and textbook covering low-level optimization and distributed systems architecture. The resource provides detailed instructions on writing assembly instructions to optimize performance-critical code and managing C-Go interoperability to bridge C libraries with Go. It also functions as a manual for implementing remote procedure call mechanisms and creating custom plugins for the Protocol Buffers compiler. The material covers high-level capabilities including the de

This project is a collection of educational resources and technical guides focused on Go performance optimization. It provides instruction on improving execution speed and reducing memory usage through code and architectural refinements. The guides cover advanced strategies for low-level programming, including the use of assembly for SIMD instructions and unsafe pointers for direct memory manipulation. It also details concurrency optimization techniques such as lock sharding and cache-line padding to reduce contention and improve hardware utilization. The material encompasses broad capabilit

IsaacGymEnvs is a GPU-accelerated physics sandbox and robotics policy training suite designed for reinforcement learning. It serves as a vectorized robotic simulator that runs thousands of parallel environments on GPUs to accelerate the training of neural networks. The project provides a sim-to-real transfer framework that utilizes domain randomization and physics variations to ensure policies trained in simulation are robust enough for deployment on real hardware. It distinguishes itself through a high-performance architecture that uses tensor-based state management to handle observations an

GEF is a Python-based extension for GDB that serves as a framework for binary analysis, exploit development, and low-level debugging. It functions as a dynamic analysis extension designed to assist in reverse engineering workflows and malware analysis by enhancing the debugger's ability to inspect process state and memory. The project is distinguished by its specialized heap analysis tools, which allow for the inspection of glibc heap arenas, bins, and chunks to detect memory corruption. It also provides a dedicated toolkit for exploit development, including cyclic pattern generation for offs

Wild is a binary linker and compiler integration tool used to merge multiple object files into single executable binaries, shared libraries, or static archives. It functions as a replacement for standard system linkers, automating the final stage of the compilation process to generate binaries across different operating system architectures. The project provides custom binary linking and toolchain integration, allowing for the modification of how compilers resolve symbols and determine memory layouts. It specifically handles the organization of machine code and data sections to meet the requi

radare2 is a reverse engineering framework and binary analysis toolset. It functions as a multi-architecture disassembler, low-level binary debugger, and hexadecimal editor for inspecting executable structures and interpreting machine code when original source files are unavailable. The framework provides capabilities for decompiling machine instructions, performing symbolic analysis, and diffing binary files to identify structural changes across versions. It also includes a digital forensic analyzer and disk analyzer for browsing filesystem formats in userland. The toolset supports binary p