Popfly used to be operated on an application framework called Microsoft Silverlight which allows you to write and run rich internet applications (which allow website features such as drag and drop, 3D effects, animation, and support various video formats, etc. – Google Maps is a classial example). Silverlight is a proprietary, programmable plug-in for Windows and Apple Macintosh and is available for all major browsers including Internet Explorer, Mozilla Firefox, Opera and Safari. Novell offers a version for Linux with the consent and support of Microsoft Moonlight. Silverlight is based on a reduced version of the. NET Framework.