http://www.reaper.fm/Reaper. One of the more full featured DAWs on the market. The license is only $60 however, you can demo the software forever. Technically you are only supposed to use the demo for like 60 days or something, but they do not disable the software in any way. I used it for like 2 years before I bought it.
Bonus, Reaper is as simple or as complex as you need it to be. I've used it to record simple covers up to live 18 track recordings.
The software has a cult of followers and is constantly being updated. At least once every couple of weeks I get a notice of an upgrade that adds features or fixes workflow bugs.