FreeStar Free Video Converter converts almost all PC video files(including RM, RMVB, AVI, ASF, WMV, MOV, MPG, MPEG, AVC, OGG, MP4, DivX, FLV (Youtube), IFO, MP3, WMA, WAV, AAC and more). Include functions of iPod Video Converter, PSP Video Converter, iPhone Video Converter, 3GP Video Converter, BlackBerry Video Converter, Zune Video Converter, AVI MPEG Converter, MP4 Video Converter, MOV converter etc.
Support YouTube ripper and converter.

It is freeware!