Moonlight is an open source implementation of Microsoft’s Silverlight web application platform. It’s built on top of Mono, the open source .Net project. What’s unbelievably cool is that a group of Mono hackers spent the better part of last month heads-down, creating a substantial portion of the Silverlight implementation from scratch:

The past 21 days have been some of the most intense hacking days that I have ever had and the same goes for my team that worked 12 to 16 hours per day every single day –including weekends– to implement Silverlight for Linux in record time. We call this effort Moonlight.

Needless to say, we believe that Silverlight is a fantastic development platform, and its .NET-based version is incredibly interesting and as Linux/Unix users we wanted to both get access to content produced with it and to use Linux as our developer platform for Silverlight-powered web sites.

There isn’t a browser plugin yet, but you can download the source tree from the Moonlight project page and contribute to the effort.

Implementing Silverlight in 21 Days – Link
Moonlight Project Page – Link