Yes, there are many examples of open source software being used in professional settings. Here are a few:

1. **Linux**: Linux is a popular open source operating system that is widely used in professional settings. It is used by many companies, including IBM, Google, and Amazon, to power their servers and run their applications.

2. **Apache**: Apache is a popular open source web server software that is used by many companies to serve web pages and applications. It is used by companies like Yahoo, Netflix, and LinkedIn.

3. **MySQL**: MySQL is an open source database management system that is used by many companies to manage their data. It is used by companies like Facebook, Twitter, and LinkedIn.

4. **WordPress**: WordPress is an open source content management system that is used by many companies to build and manage their websites. It is used by companies like The New Yorker, TechCrunch, and Sony Music.

5. **Firefox**: Firefox is an open source web browser that is used by many professionals for browsing the web. It is used by individuals and companies alike, including IBM and Cisco.

These are just a few examples of the many open source software products that are used in professional settings.
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