History has shown that open-source users prefer their software free of charge but that's a problem for a lot of companies trying to keep the lights on.

Pay - if you can - for that password manager, the pro version of your favorite browser, buy some Steam games on Linux. Do what you can to help support the cause you hold dear. Not only are you thanking a developer for their hard work, you’re showing companies that there is, in fact, a market for Linux software.