A camera designed to capture 360 degree images and video (Source)
360 degree videos are videos or still images that have been captured in a full 360 degree field of view allowing you to tilt or pan right the way round the scene, though they are not usually stereoscopic. They can be viewed through a VR headset for an immersive experience, though an app may be required.
YouTube - YouTube's channel for 360 degree videos. Can be viewed on Google Cardboard compatible headsets for an immersive experience.
Within - A company that produces 360 degree videos for media companies including Wired, The Guardian, The New York Times and many others.
Medical Realities - Read about an operation that was livestreamed in 360 degrees.