mono-mcs 1.2.4-6ubuntu6 (i386 binary) in ubuntu gutsy

 This is the Mono C# (C-Sharp) compiler, a platform-independent compiler which
 produces CIL (Common Intermediate Language) binary executables, and the
 most development tools around it like ilasm, wsdl stub generator, assembly
 linker and security tools.
 .
 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.