https://github.com/Jackett/Jackett
Qbittorrent uses plugins to the sites themselves (including to the local Jackett instance via an API):
https://github.com/qbittorrent/search-plugins/wiki/Unofficia...
And it's what I use to search for torrents.
I would never trust a site without an adblocker and keep uBlock active in Private Mode.
But with all this, you need to know what you're searching for, browsing for content is another story