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JDownloader2 asking for donations to keep it "free of advertising" while showing an ad on the same screen
(feddit.org)
It also says "free of installer bundles" while (at least in past, don't know about now) their default windows installer was including ads (source)
P.S.: If you want to disable the in-app ads, here's how to: https://gist.github.com/yunooooo/87564a0293a1c7a53fb3e233a604c638
I do not know the answer to some of your questions, but it can handle download links directly from the browser