Do you have a favorite open-source software you’re using in your professional work? Most open-source software is created by volunteers, organized as a project where the software is created. If you’re making money from the software, strongly consider giving back to the project.
You don’t have to know how to program to contribute. Answer software questions in discussion forums or social media. Make a financial donation to your project. Many projects would like help with issues peripheral to software development, like accounting, legal advice, marketing or SEO expertise, and more. So get involved and give back to the software you love!