Java и JVM - туда и обратно

Programming Languages for the Java Virtual Machine

http://www.robert-tolksdorf.de/vmlanguages.html

Java Implementations
Старый каталог: http://www.dwheeler.com/java-imp.html

IBM: http://www.ibm.com/developerworks/java
BEA: http://www.bea.com/framework.jsp?CNT=index.htm&FP=/content/products/weblogic/jrockit/
GNU: http://www.gnu.org/software/java/
bonus: http://www.gnu.org/software/java/java-software.html
Google: http://en.wikipedia.org/wiki/Dalvik_virtual_machine