Wasmer WebAssembly Runtime

Wasmer is a universal WebAssembly runtime that enables running WASM modules anywhere, from servers and edge devices to the command line and inside containers. Built in Rust for maximum performance, safety, and portability, Wasmer provides a standalone runtime that can execute WebAssembly binaries compiled from any language including Rust, C, C++, Go, Python, AssemblyScript, and more. The runtime supports multiple compiler backends including Cranelift for fast compilation, LLVM for maximum performance, and Singlepass for balance, allowing developers to choose the optimal strategy for their use case. Key use cases include serverless function execution where WASM cold-start times are measured in microseconds rather than seconds, edge computing where lightweight runtimes enable code execution close to users, containerless Docker environments, and sandboxed plugin systems. Wasmer implements WASI (WebAssembly System Interface) to grant WebAssembly modules controlled access to the operating system including file I/O, network sockets, and environment variables. The runtime supports the WebAssembly Component Model for composing modules written in different languages. Wasmer is available as a CLI tool, as embeddable libraries for Rust, Go, Python, PHP, Ruby, and C, and through a package registry for distributing and installing WASM packages. With over 20,000 stars on GitHub, Wasmer has become a leading choice for teams leveraging WebAssembly beyond the browser for secure, portable, and fast application execution.