Excluding Nyaa or private trackers, as many ongoing and more obscure titles aren’t available to torrent. I’ve been using Comick and Weeb Central, but I don’t really know how up to date they are on new scanlations as I think they’re mostly aggregating from other sources?
I use the Kotatsu android app, available on f-droid (unless it got banned) and github.
Pulls from hundreds of providers. Some of the sites don’t work without captcha, so ymmv.
Also, turn off notifications for the app, lest you recieve a hundred notifications about a site needing a captcha.