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Bywifi Video Downloader is a free program for downloading, transcoding and P2P accelerating video streaming. It supports downloading, transcoding and P2P accelerating videos from all video websites, such as Youtube, Dailymotion, Metacafe, MySpace, Yahoo, etc. Lots of advanced network technologies like P2SP (peer-to-server-and-peer), multiple tasks, web sensitive, intelligence caching are used in the software. The bitrate of video streaming is 3-5 times faster with bywifi than without it. Moreover, it can transcode videos into mobile formats for mobile phones and PDA.