Microsoft F#, May 2009 Community Technology Preview

F# is a type-safe, scalable language for the .NET platform that supports both functional and object-oriented programming. This CTP release includes the F# compiler and tools, as well as Visual Studio 2008 integration for F# development.
The F# May 2009 CTP provides all the tools and resources needed to develop applications with the F# programming language.

F# is a functional programming language for the .NET Framework. It combines the succinct, expressive and compositional style of functional programming with the runtime, libraries, interoperability, and object model of .NET. It is well suited to a spectrum of development tasks – from interactive, explorative scripting to component and large-scale software development. The CTP release of F# provides further support for explorative development using F#, as well as improved Visual Studio integration to enable large-scale, tool-based software development.
The F# CTP is available as either an MSI or a ZIP. Windows users should install the MSI, which will install all the tools and the Visual Studio 2008 integration if Visual Studio is present on the machine. Non-Windows users can save and unpack the ZIP and read the instructions in README-fsharp.html.

Fsharp.zip | InstallFSharp.msi

Source: Microsoft