FLEX machine, 1968 Smalltalks, 1971-1979 NoteTaker, 1978 Vivarium, 1986-1993 Playground, 1988-1992 Squeak, 1996- Etoys, 1997- Croquet, 2003-2007 STEPS, 2006-2012 CDG/HARC, 2013-2017 Tutor, 2016-
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