I believe the core of Gemstone is smalltalk - it's an object database/runtime and supports java as well - they also sponsored/made maglev ruby (now dead?): htt

I believe the core of Gemstone is smalltalk - it's an object database/runtime and supports java as well - they also sponsored/made maglev ruby (now dead?): https://gemtalksystems.com/about/customers/ https://gemtalksystems.com/about/customers/