Microsoft Corporation - (Free)
Experience rich Internet applications like animation, vector graphics and audio-video playback with Microsoft Silverlight.
Silverlight is a cross-platform plugin compatible with all major browsers like Internet Explorer and Firefox, which allows viewing interactive animations but also audio and video on specialized sites such as mySpace, DailyMotion community etc. It is Microsoft's answer to Adobe Flash technology.
Silverlight integrates animations and numerous geometrical forms such as ellipses, squares or other forms, having a small library with several interesting features. This software also allows playback of MP3 streams, WMA Standard.