Which software license model allows software to be freely distributed and installed without paying a license fee?

The open-source model is defined by the freedom it grants users to freely distribute, modify, and install the software without the need to pay a licensing fee. This model encourages collaboration and sharing within the software community, which fosters innovation and allows users to adapt the software to meet their specific needs. Open-source software typically comes with a license that explicitly permits this kind of use, ensuring that it remains accessible and free for everyone. This model contrasts significantly with other options, which may impose usage restrictions or require payment for access. For instance, the freemium model often involves a basic version that is free, but additional features require payment. Similarly, the closed-source model restricts access to the source code, requiring users to pay for licenses, while the pay-per-use model charges users based on their consumption. The open-source model, therefore, stands out as the only option that fully embodies the principles of free distribution and installation without a fee.