A full list of all the new/popular databases and their uses? [closed]

Recently I have found that there are many new databases popping up all around my radar, and I would like to make a list of what they do and perhaps what their advantages/disadvantages are. I'll seed the list with some names and perhaps someone with more knowledge can chip in with some information about each and how they stack up. I hope this will fast become a comprehensive list of all the available database so that developers can leverage the right one for the job at hand!

Relational Databases:

Established:

• DB2
• MySQL
• Oracle
• PostgreSQL
• SQLite
• SQL Server
• Sybase
• OpenEdge SQL

New:

• RethinkDB

Key-value stores:

• Berkeley DB
• memcached
• redis

Document oriented Stores:

• couchDB
• mongoDB

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