Mono is a platform for running and developing applications based on the ECMA/ISO Standards. Mono is an open source effort led by Novell. Mono provides a complete CLR (Common Language Runtime) including compiler and runtime, which can produce and execute CIL (Common Intermediate Language) bytecode (aka assemblies), and a class library. . This package contains the interactive C# shell named csharp. csharp permits dynamically evaluating C# statements, and can be used for writing scripts or testing code fragments. For examples and a brief overview of the commands see: http://www.mono-project.com/CsharpRepl