In July 2012, it was announced that active development on Fortress would cease after a brief winding-down period, citing complications with using Fortress's typ

In July 2012, it was announced that active development on Fortress would cease after a brief winding-down period, citing complications with using Fortress's type system on existing virtual machines. http://en.wikipedia.org/wiki/Fortress_(programming_language) http://en.wikipedia.org/wiki/Fortress_(programming_language) https://blogs.oracle.com/projectfortress/ https://blogs.oracle.com/projectfortress/ https://java.net/downloads/projectfortress/reference.pdf https://java.net/downloads/projectfortress/reference.pdf I'm just putting this here as Bret Victor's link no longer works.