WowAce

Tracks rare drops, including companions and mounts

Find five Ephemeral Crystals, get a pink hippogryph

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

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

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

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

mount and companion manager

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

Dynamic mount macro generator

Shows the health of the player's current bodyguard.

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

Don't underestimate your little critters!

Shows the source of an item as a tooltip

A Mount and Companion manager

Pet Theory

Generate a macro with random mounts

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

Interface-central mount management

Adds team information to PetBattleTeams Addon

Pet Battle Lite Frame