A simple, friendly desktop downloader for Windows, Mac, and Linux that is supported by donations rather than paywalls. Final Verdict

This is the gold standard for video downloading. It is open-source, completely free, and supports thousands of sites. While it uses a command-line interface, many "GUIs" (Graphical User Interfaces) are available to make it user-friendly.

A popular browser extension for Firefox and Chrome that can detect and download video files directly from your browser.