mono-xbuild - 6.12.0.199+dfsg-2 main

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.
.
xbuild is Mono's implementation of msbuild and allows projects that have a
msbuild file to be compiled natively on Linux.
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Microsoft Build (msbuild) is a build system developed by Microsoft similar in
spirit to Nant (in that it uses XML files for describing the build process)
and in the same spirit as make.
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http://www.mono-project.com/Microsoft.Build