Websites such as Linux Alternative are handy for finding free-software alternatives to whatever closed-source software you have in mind.  Once you know the name of the software you want to try, it’s usually easy to find it in your distribution’s package manager.  It’s all free, so there’s no reason not to give it a quick try and see if you like it.

Even if you have computers that you can’t run Linux on, Linux Alternative can help you find free and open source software that can run on Windows.