Feline Grace

You get this ability at level 6.... you get cat form at level 8.... I have a funny feeling this isn't intentional.

Possible ways to reduce or avoid damage from falling. And also self-resurrection.

ITEMS
[item=32539] Slow fall.
[item=32538] Slow fall.
[item=18951] Slow fall.
[item=9404] Slow fall.
[item=131810] Controlled flight. / Can only be used in Broken Isles.
[item=37011] Instant fly mount / Requires Hallow's End (18 Oct - 1 Nov)
[item=33176] Instant fly mount / Duration: 14 days (real time)

TOYS
[item=134021] Launch up and slow fall.
[item=113542] Slow fall. / Cannot be used while moving.
[item=119093] Launch up and controlled flight. / Can only be used in Draenor.
[item=131811] Controlled flight. / Can only be used in Broken Isles.
[item=139773] Fly up and directed "jump". / Can only be used in Broken Isles.
[item=140336] "Jump" up. / Can only be used in Broken Isles.

CONSUMABLES
Goblin Glider Kit Controlled flight.
[item=104299] 50 charges / Launch far into the distance and avoid fall damage.
[item=104346] Can only be used in Timeless Isle. / Controlled flight.
(not tested)[item=90078] 3 charges / need level <100 / Any damage protection.
(not tested)[item=104320] 50 charges / need level <100 / Any damage protection.

POTIONS (Consumables too)
Potion of Slow Fall Slow fall.
Sea Mist Potion Slow fall.
Avalanche Elixir Avoid fall damage.
[item=8529] Slow fall (1/3 chance).
[item=43472] Slow fall / Can only be used within Storm Peaks (Northrend).

ENGINEERING
Flexweave Underlay Slow fall.
Goblin Glider Controlled flight.
[item=10518] Slow fall.
[item=40727] Reverse your gravity.

RACIAL TRAITS
Pandaren - [spell=107076] Reduces damage from falling.
Goblin - Rocket Jump Directed "jump".

SELF-RESURRECTION
[item=19290] 10% chance.
[item=104328] Only usable in Pandaria.
[item=163743] Only usable in Kul Tiras or Zandalar.
Soulstone Warlock.
Reincarnation Shaman.

CLASSES ABILITIES
Warrior
[spell=6544] "Jump" to location.
Charge "Jump" to target.
[spell=198304] "Jump" to target.

Paladin
Blessing of Protection Any damage protection.
Divine Shield Any damage protection.

Hunter
Disengage Directed "jump".
[spell=186260] "Jump" to target.

Rogue
Safe Fall Reduces damage from falling.
[item=77949][item=77950] Slow fall.
[spell=195457] "Jump" to location.
[spell=51690] "Jump" to target.
[spell=36554] "Jump" to target.
[spell=231718] "Jump" to target.

Priest
Levitate Slow fall.

Shaman
Reincarnation Self-ressurection.

Mage
Slow Fall Slow fall.
[spell=45438] Any damage protection.
Blink Directed "jump".

Warlock
Soulstone Self-ressurection.
(not tested)[spell=111771]+[item=132357] Cast portal and use it.

Monk
(nope)

Druid
Feline Grace Reduces damage from falling.
Flap Slow fall.
Travel Form Instant fly mount.
[spell=102401] "Jump" to target / Directed "jump".
[spell=106839] "Jump" to target.

Demon Hunter
Glide Controlled flight.
[spell=196555] Any damage protection.
Metamorphosis "Jump" to location.
[spell=198793] Directed "jump".
[spell=195072] Directed "jump".

Death Knight
(nope)

Don't know why this was downvoted, covered everything I could think of off the top of my head. =D