InnoDB and NDB are NoSQL databases (?)
[…] we should recognize that InnoDB is usable as an embedded database without an SQL interface. Hence, it is as much of a NoSQL database as anything else labeled with that term.
I’d say it is quite difficult to start considering all embeddable databases with a custom internal API as NoSQL though.
via: http://www.xaprb.com/blog/2009/12/13/innodb-is-a-nosql-database/