WowAce

The original source for where things are in Pandaria

Officially the original source for where things are in the Broken Isles, in HandyNotes

The original HandyNotes source for where things are in Battle for Azeroth

Tracks rare drops, including companions and mounts

Officially the original source of knowledge of where things are in Draenor during Warlords, in HandyNotes

Collectinator is an addon which will scan your pets and mounts and provide information on how to obtain them.

mount and companion manager

Find five Ephemeral Crystals, get a pink hippogryph

Dynamic mount macro generator

Add-on that shows which mounts can be farmed this week

Displays Pet Info for Hunters and Warlocks. Also keeps track of Stables and Pet and Demon skills.

Auto and random summon highly customizable for your pets and mounts, with Data Broker support.

MiniPet, Always keep your little companion with you, based on the work of Carra.

Shows the health of the player's current bodyguard.

A Mount and Companion manager

Add-on that shows which battle pets can be farmed this week

The One-Key-Mount™ — Simple to use, configured with Rock

Don't underestimate your little critters!

Pet Theory

One-click smart mounting.