WavePad

http://www.nch.com.au/wavepad/

I downloaded it from their site, and although it says trial, mine still works fine! Does pop up with a reminder but I just click cancel

I used it the other day to chop out a section of a song (to make a shorter, edited version) and along with that I was able to remix the EQ on it (as it wasn't the clearest of recordings, and needed a little extra bass) amongst other things. I think it's a really usefull programme! Even for little things like when you have a track that isn't very loud - you can just load it into WavePad and increase the playback volume and save it - sorted!