Google ARCore - Google Augmented Reality SDK
Facebook 360 Photos - Share an immersive view of your world
8th Wall - Cross-Platform Mobile AR
360player.io - Display, share and embed 360° pictures
Wikitude SDK - Wikitude’s all-in-one AR SDK combines 3D tracking technology (SLAM), image recognition and tracking, as well as geo-location for apps.
Periscope Live 360 Video - A more immersive way to explore the world