1)   MKV Converter 6.63
MKV Converter is a quickly convert almost all video formats to MKV and MKV to almost all video formats including FLV to MKV,3GP to MKV,ASF to MKV,WMV to MKV, AVS to MKV,MKV to MKV,MKV to WAV, MKV to WMA,MKV to VCD,MKV to SVCD,MKV to DVD.etc.
MKV Converter, Video Converter, Media Converter, Video to MKV, MKV to Video, MKV to AAC, MKV to AC3, MKV to MP2, MKV to MP3, MKV to WAV,

 2)   RER MKV Converter 3.7.3
RER MKV Converter is an easiest to use MKV conversion application for you to convert MKV to all popular video/audio formats, such as MP4, MOV, 3GP, 3G2, MPEG, MPG, VOB, AVI, WMV, FLV, H.264, MJPEG, TS, with super fast speed and great output quality.
MKV converter, MKV to Video, MKV to MP3, MKV to video converter, convert MKV to video, convert MKV to MP3, MKV conversion,

 3)   Nidesoft MKV Converter 2.5.02
Nidesoft MKV Converter could convert MKV to AVI, MKV to MP4, MKV to MP3, MKV to Audio.
MKV Converter, MKV to MP4, MKV to AVI, MKV to iPhone, MKV to iPod, MKV to Video,