A Google profile can be linked to a user's profiles on various social-networking and image-hosting sites, as well as user blogs.
Google | Google Earth | Google Maps | Google Play | Google Chrome | Google Books | Google Scholar | Google Drive | Google.org | Google News | Google Glass | Google Calendar | Google Search | Google Sites | Google Reader | Google China | Google+ | Barney Google and Snuffy Smith | List of Google Doodles in 2013 | Google Ventures | Google TV | Google Street View | Google's | Google Lunar X Prize | Google Flu Trends | Google File System | Google Fiber | Google Current | Google Books Library Project | The Google Story |
It also has an integration with TeamCity, IntelliJ IDEA, TestLink, TestRail, and supports user authentication with Google Account, Yahoo!, OpenID and LDAP.