F#

F# is a functional-first programming language built on the .NET platform. Developers use it to write concise, robust and performant code for web applications, cloud services, data science, desktop apps, mobile development and other domains. The language combines functional programming paradigms with object-oriented features, offering strong typing and elegant syntax. F# can run on Mac, Linux and Windows, and supports development across multiple contexts including JavaScript environments and browser-based applications.

F# is open source, cross-platform and free to use with professional tooling available. It is developed by fsharp and released under an open source license. The language emphasizes immutability by default while providing pragmatic support for object-oriented programming when needed. F# integrates with the broader .NET ecosystem and offers features like pipeline operators, string interpolation and type safety to help developers solve problems efficiently.