Ardour is a hard disk recorder and digital audio workstation application. It runs on Linux, OS X and FreeBSD. Its primary author is Paul Davis, who is also responsible for the JACK Audio Connection Kit. Ardour’s intention is to provide digital audio workstation software suitable for professional use.
Released under the terms of the GNU General Public License (version two or any later version), Ardour is free software. Users who download from ardour.org are asked to pay at least $1 for downloading prebuilt binaries of Ardour; those users then have the right to obtain minor updates until the next major release. Another option is to subscribe, paying $1, $4 or $10 per month. Subscribers can download prebuilt binaries of all updates during the subscription period. (This makes Ardour an example of commercial free-libre software.) Without paying, users can download the full source code for all platforms, or a prebuilt OS X binary which lacks the ability to load or save AU plugin settings. Currently (as of June 2013) the OS X binary is an older version without MIDI sequencing capabilities.