Audacity is an audio recording tool. Not only can it record audio from multiple sources, but it is used for post-processing for any type of audio. Audactity is a great option for podcasts. You can add effects such as normalization, trimming, and fading in and out. You can take the lyrics track of off songs to create karaoke versions, you change the pitch or speed of an audio track, and is great for capturing audio.

Watch these tutorials to learn how to use Audacity.