Yes, according to Chris Seaton, one of the main Graal developers (lead, even?) a month or so ago, Substrate VM will be released to the public, sometime Real Soo

Yes, according to Chris Seaton, one of the main Graal developers (lead, even?) a month or so ago, Substrate VM will be released to the public, sometime Real Soon in early 2017: http://lists.ruby-lang.org/pipermail/jruby/2017-January/000511.html http://lists.ruby-lang.org/pipermail/jruby/2017-January/0005... Of course it doesn't clarify the licensing. But it seems like the bulk of basically all of Graal and Truffle are under the GPL and I do believe that with JVMCI, etc, making it into JDK 9 -- it seems like a pretty good bet all this will eventually be openly available. So I'm hoping for the same to be true of SubstrateVM, though I think it's in a slightly different place than Graal (Graal/Truffle are really just .jar libraries you put in the Classpath of your JVMCI-enabled JDK; they do not fork the JDK. But Substrate is clearly something else entirely, since it 'shrink wraps' your code with the JVM itself in a way). I actually just started playing with Graal yesterday, so I'm looking forward to seeing Substrate being released.