1)   MP3 Splitter Joiner Pro 4.0.0.2516
MP3 Splitter Joiner Pro splits a large MP3 file into multiple smaller pieces, and joins multiple MP3 files into a single file. You can split a MP3 file by size, count, time, and custom. The software also supports batch split and batch join.

 2)   Easy MP3 Joiner 2.8
Easy MP3 Joiner is just the piece of software you have been looking for! Just drag'n'drop your favorite music from Windows Explorer into the program window or add them through the program dialog, arrange them and press the "Join" button.

 3)   Fast MP3 Cutter Joiner 2.72.1401
Fast MP3 Cutter Joiner cuts and trims a large MP3 file into multiple smaller pieces, and joins multiple MP3 files into a single MP3. It also offers forward and backward overlap, fade-in and fade-out, keeping ID3, batch cut, and batch join.