xVST on Linux
xVST is a software on Linux that allows to download videos from streaming sites like, YouTube, Yahho Videos etc.
This is an easy to install and use app. But still you need to execute some commands.
Visit this link to download and install xVideoServiceThief on Linux OS (https://www.cpqlinux.com/how-to-download-xvideoservicethief-for-linux
/)
As of now this supports 93 websites to download videos from. Mostly all the legal websites are covered but still you can check if this tool supports video downloading from any non-listed website or not.