Novell has released Mono 1.0, an open source implementation of Microsoft's .NET framework that runs on Linux, Unix, Mac OS X, and Windows. Mono includes an ECMA Common Language Infrastructure (CLI) runtime engine, a cross platform IKVM Java runtime engine, a C# 1.0 compiler, class libraries implementing the .NET 1.1 profile, the Gtk# 1.0 GUI programming toolkit, GNU Classpath for the CLI and a Visual Basic runtime.