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This is a list of currently missing key/value stores. Please comment if you know another one that you might want to use. Implementations are also greatly appreciated!
Some implementations are not yet finished but are already in the staging branch. They need testing and fixes!
Interesting databases which currently lack a ruby binding, but claim to be very fast:
For inspiration: http://nosql-database.org/, https://github.com/datamapper/dm-core/wiki/Adapters