1)   OJOsoft FLV Converter 2.7.4
It can convert into all popular video formats including AVI, MPG, MPEG, WMV, MP4, MOV,3GP/3G2, ASF. It also supports converting video files to FLV. In the mean time, it supports converting FLV to audio formats like MP3, WMA etc.

 2)   Aiseesoft FLV Converter Suite 6.2.18
Aiseesoft FLV Converter Suite is the best FLV Converter software, which is the perfect combination of FLV Video Converter, DVD to FLV Converter and Video to Flash Converter.

 3)   RER FLV Converter 3.7.4
RER FLV Converter is a practical utility that works, as its name suggests, for FLV file conversion. All the conversions can be done both ways - from FLV to other videos, and from others to FLV easy and fast. Free to try, free upgrades.

 4)   Bluefox FLV to MPEG Converter 2.11.9.121
As the name suggests this software can converting Flash Video (FLV) videos from sites like YouTube into MPEG formats, so that they can be played in Windows Media Player.