Spin is an open-source platform for building and running microservices in WebAssembly (WASM). In previous editions of the Radar, we talked about WebAssembly in the context of browsers, but we’re now witnessing the penetration on the server side due to its capabilities for fine-grained sandboxing, cross-language interoperability and hot reloading. With Spin CLI, you can quickly create and distribute WebAssembly microservices in Rust, TypeScript, Python and TinyGo. We're excited about Spin, and we recommend you carefully assess it as it moves out of early preview.