Final answer:
Open source software is distributed free along with the program source code, allowing users to view, modify, and distribute the source code.
Step-by-step explanation:
The software that is distributed free along with the program source code is called open source software. Open source software allows users to view, modify, and distribute the source code. Examples of popular open source software include Linux, Apache, MySQL, and Firefox. Open source software promotes collaboration and transparency within the software development community.