WP Foundry supports macOS, Windows and Linux and can be activated on any number of devices. All licenses come with a 30-day money-back guarantee and a perpetual license that allow you to use the latest version available during your licensed period forever.
(If you want the free tier (up to 2 sites), don’t check the ‘Purchase License’ box. Alternatively, you can download the app and try it here. Pro is $10 for unlimited sites.)