The Levelator runs on Windows, OS X or Ubuntu and adjusts the audio levels within your podcast or other audio file for variations from one speaker to the next, for example. It’s not a compressor, normalizer or limiter although it contains all three.
The UI is simple: Drag-and-drop any WAV or AIFF file onto The Leveler’s application window, and a few moments later you’ll find a new version which just sounds better.
Here is a screenshot auf Audacity. Above, you see an Interview I did. The audio levels vary quite a bit between the three speakers. Below you see, what The Levelator made out of it.