Google+ tried to compete with Facebook and Twitter during their heydays. Google+ allowed users to network around "Circles" and mimic offline interactions.
Google Buzz was another Twitter competitor. It was a Twitter clone that displayed content in Gmail inboxes.
Developers used Google Tango, originally Project Tango, to create AR apps. Immersive gameplay is possible with these apps.
Google Wave is Google's most conceptual idea. Live internet "waves" let users publish photos, videos, surveys, and more. The platform was a futuristic email.
Google Video, like YouTube, hosted videos. The platform allowed users to upload 100 MB films for free viewing.
Google Talk before Hangouts and other Google chat tools. Gmail integration let users send chat messages from any device. Google Voice video calling is supported.