JVM Languages

What's the deal with so many JVM based languages nowadays like Clojure, Scala, Ceylon, Groovy? Besides obvious multiplatform support is there a reason for them to be JVM based or even make JVM ports of current languages? I still don't get the point of stuff like Jython.
Let's see if we can get at least a few posts without mention of FORCED COLLECTION OF GARBAGE

>>3
Anyone scared of MS should be treble-scared of Oracle.

>>2
What the hell are you talking about?

>>6
Zionist Oracle executive detected.

>>5
Anyone scared of MS should be bass-scared of Oracle.

>>5-100
Zionist Oracle executive detected.

>>1
As of why the languages exists, because Java the language itself is a shit language, its the PHP of statically typed languages.
As for why people use the JVM at all instead of compiling and running bins like a man, fuck if I know.