I'll maintain a pinned comment with all the communities/magazines for now until I find a better way to maintain them. The main links will be to kbin.social but I'll also put the magazine/community name so that it can be searched on other Kbin/Lemmy instances. If there is enough requests I can start including links to other popular instances.

Cat care and advice

• catadvice: kbin.social
  Kbin search: catadvice@lemmy.world
  Lemmy Search: !catadvice@lemmy.world

General Cats

• Black Cats: https://kbin.social/m/Black_cats
  Kbin search: @Black_cats
  Lemmy Search: !Black_cats@kbin.social

• blurrypicturesofcats: https://kbin.social/m/blurrypicturesofcats@lemmy.world
  Kbin search: @blurrypicturesofcats
  Lemmy Search: !blurrypicturesofcats@lemmy.world

• britishshorthairs: https://kbin.social/m/britishshorthairs@lemmy.world
  Kbin search: @britishshorthairs
  Lemmy Search: !britishshorthairs@lemmy.world

• cat: https://kbin.social/m/cat@lemmy.world
  Kbin search: @cat
  Lemmy Search: !cat@lemmy.world

• cat: https://kbin.social/m/cat@lemmy.fmhy.ml
  Kbin search: @cat
  Lemmy Search: !cat@lemmy.fmhy.ml

• Cats: https://kbin.social/m/Cats
  Kbin search: @Cats
  Lemmy Search: !Cats@kbin.social

• Cats: https://kbin.social/m/cats@midwest.social
  Kbin search: @cats
  Lemmy Search: !cats@midwest.social

• Cats: https://kbin.social/m/cats@sh.itjust.works
  Kbin search: @cats
  Lemmy Search: !cats@sh.itjust.works

• cats: https://kbin.social/m/cats@lemmy.blahaj.zone
  Kbin search: @cats
  Lemmy Search: !cats@lemmy.blahaj.zone

• cats: https://kbin.social/m/cats@lemmy.world
  Kbin search: @cats
  Lemmy Search: @cats

• cats: https://kbin.social/m/cats@lemmy.sdf.org
  Kbin search: @cats
  Lemmy Search: !cats@lemmy.sdf.org

• cats: https://kbin.social/m/cats@latte.isnot.coffee
  Kbin search: @cats
  Lemmy Search: !cats@latte.isnot.coffee

• cats: https://kbin.social/m/cats@lemmy.ca
  Kbin search: @cats
  Lemmy Search: !cats@lemmy.ca

• cats: https://kbin.social/m/cats@infosec.pub
  Kbin search: @cats
  Lemmy Search: !cats@infosec.pub

• cats: https://kbin.social/m/cats@lemm.ee
  Kbin search: @cats
  Lemmy Search: @cats

• cats: https://kbin.social/m/cats@eviltoast.org
  Kbin search: @cats
  Lemmy Search: !cats@eviltoast.org

• cats: https://kbin.social/m/cats@fedia.io
  Kbin search: @cats
  Lemmy Search: @cats

• Cat: https://kbin.social/m/Cat
  Kbin search: @Cat
  Lemmy Search: !Cat@kbin.social

• Cats & Kittens: https://kbin.social/m/cats@forum.fail
  Kbin search: @cats
  Lemmy Search: !cats@forum.fail

• catbellies: https://kbin.social/m/catbellies@lemmy.world
  Kbin search: @catbellies
  Lemmy Search: @catbellies

• Cat floofs!: https://kbin.social/m/floof
  Kbin search: @floof
  Lemmy Search: !floof@kbin.social

• catsinpants: https://kbin.social/m/catsinpants@lemmy.ca
  Kbin search: @catsinpants
  Lemmy Search: !catsinpants@lemmy.ca

• catlady: https://kbin.social/m/catlady@lemmy.world
  Kbin search: @catlady
  Lemmy Search: !catlady@lemmy.world

• catloaf: https://kbin.social/m/catloaf@lemmy.world
  Kbin search: @catloaf
  Lemmy Search: !catloaf@lemmy.world

• Cat loaves!: https://kbin.social/m/catloaf
  Kbin search: @catloaf
  Lemmy Search: !catloaf@kbin.social

• catposting: https://kbin.social/m/catposting
  Kbin search: @catposting
  Lemmy Search: !catposting@kbin.social

• catswithjobs: https://kbin.social/m/catswithjobs@lemm.ee
  Kbin search: @catswithjobs
  Lemmy Search: !catswithjobs@lemm.ee

• crabcats: https://kbin.social/m/crabcats@lemmy.world
  Kbin search: @crabcats
  Lemmy Search: @crabcats

• Illegally Smol Cats: https://kbin.social/m/IllegallySmolCats
  Kbin search:@IllegallySmolCats@kbin.social
  Lemmy Search: !IllegallySmolCats@kbin.social

• illegallysmolcats
  https://kbin.social/m/illegallysmolcats@lemmy.world
  Kbin search: @illegallysmolcats
  Lemmy Search: !illegallysmolcats@lemmy.world

• Kitties: https://kbin.social/m/kitties
  Kbin search: @kitties
  Lemmy Search: !kitties@kbin.social

• murdermittens: https://kbin.social/m/murdermittens@lemmy.world
  Kbin search: @murdermittens
  Lemmy Search: !murdermittens@lemmy.world

• murdermittens: https://kbin.social/m/murdermittens@lemmy.ml
  Kbin search: @murdermittens
  Lemmy Search: !murdermittens@lemmy.ml

• myfavoritecats: https://kbin.social/m/myfavoritecats@lemmy.world
  Kbin search: @myfavoritecats
  Lemmy Search: !myfavoritecats@lemmy.world

• notmycat: https://kbin.social/m/notmycat@lemmy.world
  Kbin search: @notmycat
  Lemmy Search: !notmycat@lemmy.world

• oneorangebraincell: https://kbin.social/m/oneorangebraincell@lemmy.world
  Kbin search: @oneorangebraincell
  Lemmy Search: !oneorangebraincell@lemmy.world

• piebaldcats: https://kbin.social/m/piebaldcats@lemmy.world
  Kbin search: @piebaldcats
  Lemmy Search: !piebaldcats@lemmy.world

• piratekitties: https://kbin.social/m/piratekitties@lemmy.world
  Kbin search: @piratekitties
  Lemmy Search: !piratekitties@lemmy.world

• russianblue: https://kbin.social/m/russianblue@lemmy.world
  Kbin search: @russianblue
  Lemmy Search: !russianblue@lemmy.world

• Shoulder Cats: https://kbin.social/m/ShoulderCats
  Kbin search: @ShoulderCats
  Lemmy Search: !ShoulderCats@kbin.social

• space_cats: https://kbin.social/m/space_cats@sopuli.xyz
  Kbin search: @space_cats
  Lemmy Search: !space_cats@sopuli.xyz

• standardissuecat: https://kbin.social/m/standardissuecat@lemmy.world
  Kbin search: @standardissuecat
  Lemmy Search: !standardissuecat@lemmy.world

Cats Being Cats

• Cats Are Liquid: https://kbin.social/m/catsareliquid@lemmy.ml
  Kbin search: @catsareliquid
  Lemmy Search: !catsareliquid@lemmy.ml

• cattorneys_at_paw: https://kbin.social/m/cattorneys_at_paw@lemmy.world
  Kbin search: @cattorneys_at_paw
  Lemmy Search: !cattorneys_at_paw@lemmy.world

• catbean: https://kbin.social/m/catbean@lemmy.world
  Kbin search: @catbean
  Lemmy Search: !catbean@lemmy.world

• floaf: https://kbin.social/m/floaf
  Kbin search: @floaf
  Lemmy Search: !floaf@kbin.social

• ooobigstretch: https://kbin.social/m/ooobigstretch@lemmy.world
  Kbin search: @ooobigstretch
  Lemmy Search: !ooobigstretch@lemmy.world

• Perfectly Cut Meows: https://kbin.social/m/perfectlycutmeows
  Kbin search: @perfectlycutmeows
  Lemmy Search: @perfectlycutmeows

• sillycats: https://kbin.social/m/sillycats@lemmy.dbzer0.com
  Kbin search: @sillycats
  Lemmy Search: !sillycats@lemmy.dbzer0.com

Cats with Things

• Tucked In Kitties:
  https://kbin.social/m/tuckedinkitties@lemmy.world
  Kbin search: @tuckedinkitties
  Lemmy Search: !tuckedinkitties@lemmy.world

Other (May Include Magazines/Communities that aren't purely focused on cats but frequently contain cats

• animalsbeingawesome: https://kbin.social/m/animalsbeingawesome@lemmy.world
  Kbin search: @animalsbeingawesome
  Lemmy Search: !animalsbeingawesome@lemmy.world

• aww: https://kbin.social/m/aww@lemmy.world
  Kbin search: @aww
  Lemmy Search: !aww@lemmy.world

• Aww! :https://kbin.social/m/aww
  Kbin search: @aww
  Lemmy Search: !aww@kbin.social

• Cute! https://kbin.social/m/Cute
  Kbin search: @Cute
  Lemmy Search: !Cute@kbin.social

• Nervysquervies: https://kbin.social/m/nervysquervies/newest
  Kbin search: @nervysquervies
  Lemmy Search: !nervysquervies@kbin.social

• Pet Pics: https://kbin.social/m/PetPics
  Kbin search: @PetPics
  Lemmy Search: !PetPics@kbin.social

Wild Cats

• pallascats: https://kbin.social/m/pallascats@lemmy.world
  Kbin search: @pallascats
  Lemmy Search: !pallascats@lemmy.world