IBM DB2

See the following -

IBM Throws Its Weight Behind MongoDB For Mobile Apps

Derrick Harris | GigaOM | June 4, 2013

IBM and 10gen are collaborating on a standard that would make it easier to write applications that can access data from both MongoDB and relational systems such as IBM DB2. Read More »

Open Source Databases Keep Chipping Away At Oracle’s Empire

Klint Finley | WIRED | January 7, 2015

The three fastest growing databases of 2014 were all open source, according to a new report from DB-Engines, a site that tracks popularity in the rapidly changing database marketplace...

Read More »