We don't know any good NoteBurner Netflix Video Downloader open-source alternatives yet.
You are more than welcome to suggest any alternatives that you know of, or ask the community for suggestions.
Alternatively, we recommend checking out LibHunt for open-source libraries and alternatives to NoteBurner Netflix Video Downloader.
I had a little problem at the very beginning and the technical team quickly replied to my email and solved the problem for me. Now the process is running perfectly! Plus the download speed is very fast, I can download a TV episode in a few minutes.