You mean like an RSS reader? Check out FreshRSS. It’s been my go-to since Google’s RSS reader shutdown.

Well, if what you’re looking for is not on Readarr, there’s Kapowarr. I haven’t tried it though because I use Tachiyomi on mobile and haven’t bothered to switch to a selfhosted option yet because that’s been working fine. There’s also some other projects, but the ones I looked at back when I was searching hadn’t been updated in years, and I imagine that hasn’t suddenly changed recently.

I’m unsure, but I’m an avid user of Mihon (formerly Tachiyomi). Basically God’s gift to Android. Would recommend giving it a look!

In addition to what others say, you can also try WebToEpub (with a delay) for some comics. It works well with web comics.

freshrss is also great at ongoing series.

Not exactly what your are looking for, but mihon (formerly tachiomy) fixes my webcomic need. It is both a reader and a downloader. You have different scrapping extension for many sources, thus you can pretty much find anything. If you are fine with a (android) phone only workflow, I recommans you give it a try.

I asked something similar (its just asking about ebooks) and some of the answers there may help:

mander.xyz/post/39809286

I have notes for a follow up but I didn’t finish my testing and am still using mostly commercial options.

I think I didn’t find anything good for syncing between devices (unless own a kobo reader) but Calibre OPDS was workable as a server and both Booklore and Calibre Web had options for downloading but both have to deal with book torrents often not being available / bundled without the name and I think I liked Booklore more, but was going to go with Calibre Web since I thought I could share the library file (and I travel so for now my “server” is a virtual machine on my laptop that is often not running).

I use komga.org

@StarvingMartist

https://dosage.rocks/ - a webcomic downloader and archiver

This is what I use on my server.

github.com/Suwayomi/Suwayomi-Server