Mono is a platform for running and developing applications based on the ecma/iso standards. mono is an open source effort led by xamarin. 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 includes a version of the gac (global assembly cache) tool (gacutil) used by mono to store shared cil (common intermediate language) libraries, for cli 2.0