Just to clarify, when you say "anything" do you mean things like soundcloud and youtube ?
Is this an alternative to a tool like youtube-dl ?
youtube-dl --external-downloader=aria2c https://www.youtube.com/watch?v=dQw4w9WgXcQ
Many applications (youtube-dl through --external-downloader) can use aria2c as a "downloader backend".
aria2c + https://github.com/ziahamza/webui-aria2 offers a very fast, portable and simple download manager.
aria is also controllable by Python via XML-RPC - seen that in the docs, on my stack to try, could be useful.
Just to clarify, when you say "anything" do you mean things like soundcloud and youtube ?
Is this an alternative to a tool like youtube-dl ?