GearVR and Unity

You can build your app in Unity and see / play it in Gear VR, in a couple of steps. (Updated Oct 2016)

For PC users: http://www.androidauthority.com/create-first-gear-vr-app-690512/
(also helpful for Android SDK & JDK installation - https://cgcookie.com/2015/12/16/quick-start-guide-gear-vr-unity/)

For Mac users: {{#ev:youtube|2pgbUBMnbtw}}