Ardour is a free, open source digital audio workstation. Originally developed for Linux operating systems, it eventually developed a version for Mac and, most recently, the engineers have ported the software to Windows.
Ardour provides your standard Record-Edit_Mix functionality. It provides a host of plugins from EQ to reverb to compression and flange. It requires that you know what you’re doing as the plugins do not have presets as many other DAW’s do.