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Biglog is a log-structured storage system with an in-memory index. It is designed to be safe, reliable and fast. With transactions, unlimited multi-values (ie. queues), sparse/wide columns, column-families, streaming, BLOBs, and regex searches on keys/columns and secondary indexes.
Bigdog is a wrapper for managing multiple Biglog instances, for example transactions over multiple data sets or replicas/mirrors.
Vermeer is clustered database server for doing transactions. It's to Bigdog what that is to Biglog. Which means? Well, just run up a single server instance and send JSON request objects over a TCP socket. Run up another instance or two and you have a cluster, with atomic distributed transactions.
Shut down one server, and bring it back up sometime... it will synchronize with the cluster and update itself.
Use simple get/set/del or Linda