Prototyping of SharpDevelop 4.0 started on 5th of August 2008, with first screenshots released even before they shipped SharpDevelop 3.0. The prototype was ported to .NET 4.0 when its Beta 1 was released, and their team shipped a Beta 1 Preview when .NET 4.0 RC became available. The team went through four Beta releases and two release candidates before hitting their release milestone.
SharpDevelop it’s an Open Source IDE for C#, VB.NET, Boo, F#, IronPython and IronRuby on Microsoft’s .NET platform.
With the release of version 3.2, the development team included full support of IronRuby 1.0 which is also an Open Source implementation of the Ruby programming language targeting Microsoft .NET Framework, heavily relying on Microsoft’s Dynamic Language Runtime (DLR).
SharpDevelop 3.2 currently supports .NET Framework 3.5, the support of .NET 4.0 will be part of SharpDevelop 4.0 which will be released soon.
So, what are you waiting for? Get your hands on SharpDevelop.