• joeq - a JVM written in Java: http://joeq.sourceforge.net/
• JRockit - a "server" JVM written by a small co that was acquired by BEA, now available for free download and use (no source available). Only works on Intel chips, might be good on Linux as it manages its own threads (so at least WL on linux won't drive top nuts). http://www.bea.com/products/weblogic/jrockit/

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