AUDACITY is a free and powerful tool for audio editing.What makes this tool beter than all the other programs ?http://audacity.sourceforge.net/about/featuresWhere can I get it ?http://audacity.sourceforge.net/download/
I already have it
If you wanna sounds you con find a lot with the page findsounds.com to edit them like you want with audicity.
for voice acting i use the sony vegas.and the soundforge for fixing.i got it for free
I really love sony vegas, not too difficult but really powerful But for FX I prefer Adobe After effects
My uncle is in audio production and he uses ProTools, a little overboard for us though I think. It is the best in class though.
For voice editing or voice correction I use Melodyne.Really awesome piece of software