Novell has released Mono 2.4, an open source implementation of Microsoft's .NET framework that runs on Linux, Unix, Mac OS X, and Windows. This release mostly seems to improve the implementation without changing much at the API level. "This is a release focused on stability and performance and it is also the foundation for Novell's own long-term support Mono-based product." Mono supports roughly Visual Basic.NET and C# 2.0 with some 3.0 support.