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My two friends do amazing plugins and apps for FA!
/u/RingoTheFox does FA Notify, which is brilliant for an alerter, and I've used it before - works really well! Unfortunately it's only on Chrome App Store, but I can tell you it's really good! The link is here. This has the Veldt seal of approval, and trust me, Ringo and Menos, who both co-deved the app, is insaaaane!
Although, if you're like me and want something for your phone, going off topic, I highly suggest my good man /u/NeonTheWolf's app FurFeed, which is pretty insane considering it takes a lot of stuff from the fandom, here, RSS feeds, you name it, and mashes it altogether. And you can find that here for Android only.
I don't really know of any others though...
Furfeed was a furry news aggregator I published onto the Google Play Store, using a platform I no longer like. It reached 5000 downloads, and brought people to new furry content, and to /r/furry. But it has seen some neglect, and it has seen better days. For example, the themes are very dated, it only just got material design, and there are too many advertisements.
So, I am planning to make a change, and release a new, improved version of Furfeed by the end of the year. I am still deciding on the name but so far I am going with the vastly unoriginal Furfeed 3.0 (Was considering Furfeed NEO, but it has just too much drama ;) )
I will be using a new platform, with improved theme and hopefully in the future web support. iOS support unfortunately is not on the roadmap, due to high costs.
You can try the old Furfeed here! https://play.google.com/store/apps/details?id=com.neonworks.furfeed&hl=en
(also i noticed it was removed from the sidebar, but I think it was for good reason, the app needs improvement)