ObjectDB for Java/JDO is a powerful yet compact Object Database (ODBMS) for Java, written entirely in Java, and compliant with the Java Data Objects (JDO) standard developed by Sun. ObjectDB for Java/JDO is designed to handle efficiently databases of various sizes, ranged from a few KBs to hundreds of GBs. Among its features are small footprint, high performance, rapid development, easy deployment and flexible architecture (1-Tier, 2-Tier or N-Tier). A Free Java Object Database Download is available for non commercial use.