The Random MixTape Maker allows you to make mixes from multiple mp3 sources. This basically creates fresh new playlists that you can customize; anything from time length to what directories the songs are in.
You can set up lists so that there is always a blacklist where you don’t ever add those songs, or randomize the list completely for a fresh sound. You can also preview the songs from the list to make sure you know exactly what you’re creating and you’re not putting rap next to Metallica (unless that’s exactly what you were trying to accomplish).
Donationware for Windows.