In this short appendix, I've tried to capture the promise of the Mono platform in a few simple examples. Granted, if you intend only to build .NET programs for the Windows family of operating systems, you might not have encountered companies or individuals who actively use Mono. Regardless, Mono is alive and well in the programming community for Mac OS X, Linux, and Windows.
For example, navigate to the /Software section of the Mono website:
At this location, you can find a long-running list of commercial products built using Mono, including development tools, server products, video games (including games for the Nintendo Wii and iPhone), and medical point-of-care systems.
If you take ...