Open-source alternatives to Wasm3

The WASI SDK is a comprehensive compiler toolchain designed to transform C and C++ source code into portable, sandboxed binary modules. It provides the necessary utilities to target the WebAssembly System Interface, enabling native code to execute across diverse hardware and operating system environments through a standardized interface. The toolkit distinguishes itself by providing a complete, sysroot-isolated environment that ensures build consistency regardless of the host operating system. By bundling compilers, system headers, and libraries into unified, portable archives, it facilitates

mruby is a lightweight Ruby interpreter designed to be embedded into C applications. It compiles Ruby source code into a compact, platform-independent bytecode that executes on a register-based virtual machine, and exposes a stable C API for host programs to initialize the interpreter, load bytecode, and invoke Ruby methods at runtime. The interpreter distinguishes itself through a tightly coupled parser and compiler that performs lexical analysis, syntax parsing, and bytecode generation in a single pass without constructing an intermediate AST, minimizing memory overhead. It also includes a

Lua is an embeddable scripting language written in ISO C, designed to be integrated into host applications for runtime customization. It provides a C-based scripting engine and a prototype-based object model that utilizes associative arrays and metatables to implement inheritance and complex data structures. The language features a cooperative multitasking system that manages concurrent execution threads via coroutines and an incremental garbage collector for automatic memory management. It includes a safe code sandbox to isolate global state and run untrusted scripts within a protected envir

Walt is a transpiler and typed language that converts a JavaScript-like syntax into WebAssembly binary format. It functions as a toolchain for developing high-performance logic for browsers and runtimes by translating typed source code into WebAssembly text format. The project includes a bundler-integrated loader that automates the recompilation of source files during the build process. It provides a linear memory manager used to define custom data layouts, structs, and memory allocators within a contiguous heap. The language supports defined function signatures, numeric types, and the abili

Cython is a compiler that translates Python code into C or C++ to create high-performance extension modules. It functions as a static typing optimizer and a C extension generator, allowing developers to declare C types within Python code to reduce interpreter overhead and increase execution speed. The project enables the wrapping of external C libraries to provide high-level interfaces to low-level system capabilities. It also serves as a native binary packager, capable of freezing scripts and their dependencies into standalone executable binaries for distribution. The system covers a broad

Wasmer is a high-performance runtime engine designed to execute sandboxed WebAssembly modules across server-side, edge, and browser environments. It functions as a comprehensive platform for building, distributing, and running isolated applications, providing a secure and portable execution layer that maintains consistency across diverse hardware architectures and operating systems. The platform distinguishes itself through a robust toolchain that enables cross-language interoperability and the transformation of code into portable binary packages. It supports ahead-of-time binary generation t

Cling is an interactive C++ interpreter and read-eval-print loop that allows for the execution of C++ code in real time. It provides an interactive environment where statements can be evaluated immediately, bypassing the manual compilation and linking cycles typically required for the language. The system functions as a Jupyter C++ kernel, enabling cell-based development and visualization within notebook interfaces. It also supports the loading and execution of external source files within an active session. The environment includes capabilities for just-in-time debugging and profiling by em

WasmEdge is an extensible WebAssembly runtime that executes WebAssembly bytecode in a secure sandbox for cloud, edge, and embedded applications. It functions as a multi-language compiler, compiling applications written in Rust, JavaScript, Go, and Python into WebAssembly bytecode for sandboxed execution, and as a server-side JavaScript runtime that runs JavaScript programs with ES6 modules, NPM packages, and Node.js-compatible APIs. The runtime also serves as an AI inference runtime, executing AI models from JavaScript using WASI-NN plug-ins for inference tasks on personal devices and edge har

This project is a Lisp interpreter implementation guide and framework designed to teach the core principles of programming language design. It provides a structured, step-by-step technical framework for building a functional Lisp language from scratch, featuring a specialized interpreter engine and an S-expression parser that converts syntax into abstract syntax trees. The project emphasizes a code-as-data metaprogramming framework, enabling the implementation of macros, quoting, and quasiquoting to transform expressions during evaluation. It is designed with host language agnosticism, allowi

This project is a comprehensive Lisp AI implementation library that provides reference implementations for various artificial intelligence paradigms and symbolic algorithms. It functions as a multi-purpose toolkit containing a logic programming engine, a natural language processing suite, and a symbolic mathematics toolkit. The library is distinguished by its diverse architectural frameworks, including a Prolog-style execution engine that uses unification and goal-driven backtracking, and a system for simulating human decision-making through expert system shells and certainty factors. It also

Wasmtime is a WebAssembly runtime and sandboxed bytecode executor designed to run WebAssembly bytecode on a host system. It functions as an embeddable engine that integrates into applications through native APIs and language-specific bindings, as well as a standalone execution environment accessible via a command line interface. It is a WASI compatible runtime, implementing the WebAssembly System Interface to provide portable access to system resources. The engine utilizes a JIT compilation model to translate intermediate representation into optimized machine code for various CPU architecture

ChakraCore is an embedded JavaScript engine designed to be integrated as a library within a host application. Its primary purpose is to provide a programmable scripting layer and a lightweight runtime environment for executing JavaScript code and managing state via a programmatic interface. The project focuses on bridging high-level scripting with low-level system calls through a C API. This allows developers to implement custom scripting engines and embed JavaScript execution directly into applications to enable task automation and functional extensions. The engine utilizes a bytecode-based

wazero is a pure Go WebAssembly runtime that compiles and executes Wasm modules without CGO or any external dependencies. It provides a zero-dependency engine that runs on every Go-supported platform, including riscv64, making it a fully self-contained solution for embedding WebAssembly execution inside Go applications. The runtime offers two execution modes: an ahead-of-time compiler that translates WebAssembly modules into platform-specific machine code for near-native performance, and an interpreter that executes bytecode directly for maximum portability across architectures. Each module i

Napajs is an embeddable JavaScript engine and multi-threaded runtime designed to be integrated directly into other software applications as a component. It serves as a parallel computation framework that allows JavaScript code to execute across multiple threads, bypassing the standard single-threaded event loop limitation to handle CPU-intensive tasks. The runtime is distinguished by its ability to load and execute modules from the NPM ecosystem and its pluggable execution environment. This architecture allows for custom implementations of memory allocation, system logging, and performance me

FrankenPHP is a Go-based PHP runtime and application server that integrates a web server and PHP interpreter to host applications without requiring a separate process manager. It functions as a worker mode server that keeps applications in memory across requests to eliminate bootstrap overhead and a static binary bundler that packages applications and the server into a single self-contained executable. The project distinguishes itself by allowing the embedding of a PHP runtime directly into Go programs and enabling the development of PHP extensions using the Go language. It also includes a bu

Monty is a sandboxed execution environment designed primarily for running Python code generated by AI models. It provides a secure, isolated runtime that blocks host access, enforces resource limits, and supports pre-execution type checking against built-in type hints to catch signature mismatches before code runs. The sandbox can persist its interpreter state at external function calls, allowing execution sessions to be serialized, stored, and later resumed from a file or database. What distinguishes Monty is its combination of stateful, resumable execution with multi-language native embeddi

wasm-bindgen is a glue code generator and interoperability tool that facilitates high-level communication and data exchange between compiled Rust modules and JavaScript environments. It functions as a memory bridge and type definition generator, allowing the exchange of complex data types and the calling of functions across execution boundaries. The project distinguishes itself by automating the conversion of data types and function signatures using attribute-based bindings. It generates the necessary JavaScript and WebAssembly wrappers to manage linear memory mapping and creates automatic Ty

This project is a Linux game distribution client, digital game storefront, and gaming runtime. It provides a desktop interface for discovering, purchasing, downloading, and launching digital video games on Linux operating systems. The software implements a translation layer that converts Windows API calls into Linux system calls to enable the execution of non-native binaries. It utilizes a container-based runtime environment and kernel namespaces to ensure binary and dependency compatibility across diverse Linux distributions. The system includes a display manager that abstracts the interfac

Lucet is a WebAssembly runtime and sandboxing compiler that translates WebAssembly bytecode into native machine code. It serves as a secure execution environment and native code generator designed to run untrusted code while preventing unauthorized access to host system resources. The project focuses on high-performance sandboxing by using ahead-of-time compilation to achieve near-native execution speeds. It implements software-based fault isolation and a host-call interface to manage secure communication and data exchange between the isolated module and the external host application. The sy

AssemblyScript is a compiler and tooling suite used for WebAssembly module development. It converts a subset of TypeScript syntax into binary modules to achieve high execution speeds and cross-platform binary execution. The project focuses on translating typed source code into the compact binary format required by WebAssembly runtimes. This allows for the movement of computationally heavy logic into binary modules for browser performance optimization and execution across different operating systems. The compilation process involves TypeScript-compatible syntax analysis and the generation of

XenonRecomp is a static binary translator and Xbox 360 game recompiler. It functions as a binary analysis tool and native code generator that converts machine instructions from Xbox 360 game executables into C++ source code for recompilation on different hardware platforms. The tool features specialized capabilities for translating compiled binaries, including the conversion of assembly jump tables into native switch cases and the detection of function boundaries using stack space data and branch link instructions. It optimizes translated code by converting non-volatile and non-argument regis

This project is a comprehensive technical interview preparation guide and computer science knowledge base. It serves as a structured study resource designed to help software engineers review core engineering concepts and prepare for professional coding assessments. The repository focuses on a wide array of theoretical and practical domains, including detailed references for mobile application architecture and operating system fundamentals. It provides curated materials on software architecture patterns and network protocol analysis to support professional development. The content covers foun

Ish is a Linux shell emulator for iOS that provides a local terminal environment for running shell commands and managing files. It functions as an instruction-level emulator that enables the execution of Linux binaries on mobile devices by simulating an Alpine Linux environment. The project distinguishes itself by combining user-mode Linux emulation with a virtual root filesystem. This allows the software to map Linux kernel system calls to host functions and execute scripts and toolsets directly on an iPhone or iPad. The emulator also provides low-level program debugging capabilities, inclu

Box64 is a cross-architecture runtime and user-mode emulation layer that allows Linux and Windows software to run on non-native hardware. It functions as an x86-64 instruction emulator and binary translator, executing 64-bit binaries on different CPU architectures by translating machine code into native instructions. The project utilizes dynamic recompilation to accelerate execution and maps guest system calls to native host libraries to increase speed and hardware compatibility. It can simulate a 32-bit execution environment to support legacy software and integrates with the operating system

rusty_v8 is a Rust wrapper for the V8 JavaScript engine that allows for the embedding of a JavaScript runtime into native applications. It provides core components for managing engine bindings, memory allocation, sandboxed isolates, and the execution of WebAssembly modules. The project features a native host function bridge to map Rust functions to JavaScript objects and a dedicated memory allocator to manage thread-safe allocation and heap pressure. It includes a system for compiling and executing binary WebAssembly modules within the hosted native environment. The runtime covers capabiliti

This project is a comprehensive educational guide and technical manual for the Ethereum blockchain. It provides structured instruction on blockchain fundamentals, smart contract development, and the architectural principles of decentralized applications. The resource covers technical domains including smart contract security auditing, network administration, and web3 programming. It details the implementation of token standards, the use of mnemonic seeds for wallet integration, and the creation of censorship-resistant application architectures. The documentation extends to system-level opera