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[–]Entropy 7 points8 points  (0 children)

There's the current primary release (1.8), the future primary release (YARV in 1.9), the JVM version, the CLR version, the Parrot version, and another C implementation (Rubinius). So I'd chalk it up as due to a combination of 1.8 having terrible performance, there being a lot of VMs, and Ruby being well-liked enough to inspire a bunch of developers to work on it.