Standard Assets (for Unity 2018.4)
Unity Technologies
★★★★
Free Download

Free Platform Game Assets
Bayat Games
★★★★★
Free Download

Bolt
Unity Technologies
★★★★
Free Download

Terrain Tools Sample Asset Pack
Unity Technologies
★★★★
Free Download

Sunny Land
Ansimuz
★★★★★
Free Download

AllSky Free - 10 Sky / Skybox Set
rpgwhitelock
★★★★★
Free Download

Dream Forest Tree
IL.ranch
★★★★
Free Download

Oculus Integration
Oculus
★★★
Free Download

PUN 2 - FREE
Exit Games
★★★★
Free Download

Outdoor Ground Textures
A dog's life software
★★★★
Free Download

Mirror
vis2k
★★★★★
Free Download

Basic Motions FREE Pack
Kevin Iglesias
★★★★★
Free Download

Grass Flowers Pack Free
ALP8310
★★★★★
Free Download

Unity-Chan! Model
unity-chan!
★★★★★
Free Download

Conifers [BOTD]
forst
★★★★★
Free Download

Unity Particle Pack
Unity Technologies
★★★★
Free Download

3D Game Kit
Unity Technologies
★★★★
Free Download

DOTween (HOTween v2)
Demigiant
★★★★★
Free Download

Low Poly FPS Pack - Free (Sample)
David Stenfors
★★★★★
Free Download

Nature Starter Kit 2
Shapes
★★★★★
Free Download