Amalgam	1	3K27	April 2006	Public launch
Brass	2	5Z71	April 2009	Faster and tidied up (renamed "cBlorb")
Chromoly	3	6E36	April 2010	Extended to release interpreters	
Duralumin	4	*9Z99	31 December 9999	Unicode support (renamed "inblorb")