Windows only: MP3DirectCut is a non-destructive MP3 editor. Quickly slice and dice your MP3 files without having to decompress them for editing.
If you need to quickly alter an MP3 without compromising quality MP3DirectCut allows you to cut, copy, paste as well as change the volume, fade and normalize MP3 audio all without having to decompress the file. In addition to the basics functions it has a built in ID3 editor, cue sheet support, loop play, and command line support. Save yourself the hassle of decompressing and re-encoding your files over simple edits. Although it the download is an installer, all application settings are written to the local folder. The application is fully portable, simply delete the desktop shortcut it creates after you install it to your flash drive. If you're looking for a straight forward way to quickly merge your MP3s together, check out MP3 Merge. MP3irectCut is freeware, Windows only.