FLV player

FLV Player allows Flash developers to playback .flv files without the need to load them from a server. Just select the file or drag/drop it onto the player to view it. Standard playback controls included. The program can be optionally associated with .flv files, so you can just double-click them to play.

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Free Online FLV Converter

FLV Online Converter, currently at version 0.5.1202, is developed by a Japanese. FLV Online Converter service converts a FLV file downloaded from video hosting and sharing sites such as Youtube’s movie, Google Video etc and transform the flash video to another video format in AVI, MOV, MP4, MP3 or 3GP. The service is using a unique technologies called FLV Lossless Converter (FLVLC) which is able to convert FLV to MPEG4 faster and losslessly than a typical transcoder.

Other are ZAMZAR,MODIFYVIDEO,MEDIA-CONVERT.