This round up is fairly accurate. One thing worth mentioning is that all of these tools can be bent to be used outside their comfort zone (just like an RDBMS) s

This round up is fairly accurate. One thing worth mentioning is that all of these tools can be bent to be used outside their comfort zone (just like an RDBMS) so you don't have to have a stack of 5 different databases, if you enjoy getting the job done with one.