[athrun]

This is Gartner's famous "Magic Quadrant".

[scholia]

You can download the whole report from Microsoft (not surprising, since it came out top):

https://info.microsoft.com/CO-SQL-CNTNT-FY16-09Sep-14-MQOper...

I've posted a big version of the Magic Quadrant here: http://imgur.com/3qFwPd6

[chris_wot]

Which is largely used for propaganda and often doesn't exactly mean very much.

[scholia]

The Magic Quadrant is just the eye-catching bit of what is generally a fairly substantial (15,000-25,000 word) report.