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 .NET CLR including compiler and runtime, which can produce and execute CIL bytecode (assemblies), and a .NET class library. . This package contains the Mono class library version 1.0 (cross-platform CIL (.NET) libraries) that are used by nearly all CLI (.NET) programs on the system.