What is free and open source software and why can it cost money?

Free software indicates that the software does not have any constraints on copyrights while open source software enables easy and effective collaboration on software development and distribution without any need for reverse engineering.

Free and open-source software - Wikipedia

Opensource Software vs Free Software vs Freeware Software

Blog - OpenProject - Page 19

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What is open source?

Solved Six Pros and cons of Open Source Software When

How to Value Open-Source Software

Open-Source Software vs. Proprietary Software

What is Open Source and How Does It Work?

What is Open Source Software