Great Downloader easy to use can convert into multiple file formats. Fast and impressive
Jupyter - Project Jupyter exists to develop open-source software, open-standards, and services for interactive computing across dozens of programming languages. Ready to get started? Try it in your browser Install the Notebook.
Video DownloadHelper - Browser extension to download videos from the Web
Observable Notebooks - The portfolio and technical blog of Chris Henrick โ provider of professional web development, data visualization, GIS, mapping, & cartography services.
youtube-dl-gui - A cross platform front-end GUI of the popular youtube-dl written in wxPython.
Calculist - The open-source, web-based thinking tool that facilitates effective thinking for solving problems.
Youtube Video and Audio Downloader - Download YouTube videos in all available formats and extract the original audio files.