I made Video Studio, a free, open source web app that turns a GitHub repo, web pages or a Google Doc into a narrated demo video. It writes the script from your sources and shows the lines each part is based on, so you can check every claim. You can edit any line by hand or just ask for a change, pick a voice and music, and it renders an MP4 with captions into your Google Drive. It started as a tool I built at work, and this is my own open source version.
The code is on GitHub under the MIT license: github.com/tom4cam/video-studio.
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