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

This is what I use on my server.

https://github.com/Suwayomi/Suwayomi-Server

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!

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

https://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).

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.

@StarvingMartist@sh.itjust.works

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

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 use https://komga.org/