Fable: F# to JavaScript Compiler

Fable is an F# to JavaScript compiler that leverages the F# compiler service and Babel to emit clean, readable JavaScript. It compiles F# source code directly (no .NET bytecode), includes a minimal runtime (~20KB min+gzip), and integrates with the JavaScript ecosystem (ES6 modules, npm, Webpack). Current stable version is 5.0.0 (released 2024-08). Release cadence: major versions (4.x, 5.x) have been stable for years; pre-release RCs and alphas are frequent (multiple per month). Differentiators: F# fidelity (most F# core library, quotations, type providers), multi-target (JS, TS, Python, Dart, Rust, Erlang/BEAM), and no runtime overhead.