Beginning Questions

Dear all,

I am new to Mono and I am considering it for a new web project.
What I would like to know (and I couldn't straightforwardly find an
answer to) is:
 - is it possible to develop commercial web applications in which you
can pack a whole web app and send it to a client without disclosing
the source?
 - is there any library of existing components already implemented?
 - which solutions are provided as development environments for major
platforms (Linux, Mac OS X, Windows)?

Cheers,

Paulo Matos