A free program for Android, by Desaxed Studios.

Bass Booster is a powerful bass-boosting app for Android that can make your music even louder and more bass-forward. It works great with most music players and can even be used as a standalone audio player. The app comes with 20 pre-set bass presets that you can easily change to suit your preference. You can also create your own custom presets and share them with other people. It comes with a powerful virtualizer and can also be used as a sound effect. It can be used as a virtualizer on music that you already have, or you can record it with the built-in mic.