> Java and Flash are closed/proprietary products that are
> difficult to emulate.

Seems you've missed some things. SUN's Java was open sourced as long as 4 years ago:

http://en.wikipedia.org/wiki/OpenJDK
http://en.wikipedia.org/wiki/IcedTea
http://openjdk.java.net
http://icedtea.classpath.org

And Adobe's Flash, while not being open sourced, got most if its specs published starting 3 years ago, which has helped projects like Gnash and Lightspark evolve:

http://en.wikipedia.org/wiki/Adobe_Flash#Open_Screen_Project
http://www.openscreenproject.org
https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=7395&forum=11&start=8

Regarding Java for AmigaOS/MorphOS:

https://morph.zone/modules/newbb_plus/viewtopic.php?topic_id=7137&forum=9&start=12
http://jamiga2.blogspot.com/2011/07/jamiga-team.html (from 3 weeks ago)