Unity Guides

Google Cardboard:

• Make a VR Game With Unity and Google Cardboard

Samsung Gear VR:

• Gear VR Experience Design Handbook
• Tech Tips for Gear VR Development

Oculus Rift:

• VR Sickness, The Rift, and How Game Developers Can Help
• Build a Simple Oculus Game
• VR Overview

• Tips and Tricks for Room Scale

Unreal Engine Guides

General Stuff

• VR Cheat Sheet
• VR Best Practices
• Motion Controller Setup

Samsung Gear VR

• https://docs.unrealengine.com/latest/INT/Platforms/GearVR/index.html

Oculus

• https://docs.unrealengine.com/latest/INT/Platforms/Oculus/index.html

HTC Vive

• https://docs.unrealengine.com/latest/INT/Platforms/SteamVR/index.html