Re: free version works for 10 minutes
Ardour is licensed under the GPL, which means that the source code is available without charge, and that the program is freely redistributable. We also have a robust open source development process: accepting PR's and patches, and with an open, public bug tracker.
But we (Ardour developers) provide ready-to-run binaries for Linux (all distros except NixOS), macOS and Windows, and these are the only versions of Ardour we support. These are not available without paying at least US$1. You are free, of course, to redistribute/copy them if you wish to. This mechanism is how the work on the program is funded - in particular, it is about 95% of my income.