Operative systems that allow users to modify the source code freely are classified as what type of OS?

Operating systems that allow users to modify the source code freely are classified as open-source operating systems. This classification is rooted in the principles of open-source software, where users have the freedom to view, edit, and distribute the source code. This approach fosters a collaborative environment, allowing developers and users to contribute to the software's evolution, enhance its features, and fix bugs.

Open-source operating systems typically follow licenses that promote these freedoms, ensuring that anyone can access the source code and make improvements or modifications as they see fit. Examples of such operating systems include Linux and FreeBSD, which have robust communities that actively contribute to their development.

In contrast, proprietary operating systems restrict access to the source code, making it impossible for users to modify the software without permission from the creator. Free operating systems may allow for some level of modification but do not necessarily grant the same freedoms associated with open-source licenses. Embedded operating systems are designed for specific hardware applications and are not necessarily tied to the concept of modifiable source code.