1)   MP3DJ PRO 3.0
It will play songs and mix them together in the most simple way. only four settings are needed: Transition Type, Transition Time, Cut First and Cut Last seconds of each mixed song. using more than one sound card in the same computer

 2)   MP3DJ 3.0
MP3DJ is a Dj Software tool that allows you to playback mp3 files with transitions in between songs very easy to use and stable interface