High Quality Content by WIKIPEDIA articles! Moonlight is a free and open source implementation of the Silverlight web application framework. Silverlight was originally developed by Microsoft. Moonlight is being developed by the Mono Project. Moonlight 1.0 was released on January 20, 2009, and Moonlight 2 was released December 17, 2009. Moonlight 1.0 was released on January 20, 2009, and Moonlight 2 was released December 17, 2009.