Is open source software free?
Free and open-source software
"Free and open-source software" (FOSS) is an umbrella term for software that is simultaneously considered both Free software and open-source software. FOSS (free and open-source software) allows the user to inspect the source code and provides a high level of control of the software's functions compared to proprietary software. The term "free software" does not refer to the monetary cost of the software at all, but rather whether the license maintains the software user's civil liberties ("free” as in “free speech,” not as in “free beer”). There are a number of related terms and abbreviations for free and open-source software (FOSS or F/OSS), or free/libre and open-source software (FLOSS or F/LOSS -- FLOSS is the FSF-preferred term).
List of free and open-source software packages
Some of the open-source applications are also the basis of commercial products, shown in the List of commercial open-source applications and services.Be advised that available distributions of these systems can contain, or offer to build and install, added software that is neither free software nor open-source.