MapDB provides concurrent Maps, Sets and Queues backed by disk storage or off-heap-memory. It is a fast and easy to use embedded Java database engine. This project is more than 12 years old, you may know it under name JDBM. MapDB is free as speech and free as beer under Apache License 2.0
2013-06-18 I left my daily job and now I work on MapDB full time
2013-06-02 MapDB 0.9.3 was released. Fixed data corruption in Write Ahead Log and improved serialization release notes
2013-05-19 MapDB 0.9.2 was released. It fixes bugs and introduces Data Pump, release notes
2013-04-22 Blogpost outlining my future plans with MapDB has been posted
2013-04-14 MapDB 0.9.1 was just released. It fixes dozen of critical bugs and upgrade is highly recommended. Release notes are here
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Find out more about MapDB on Github page