nostr:npub1fdcpfzaqf28emyhg7rw7wtfmy6xeqcvt5wezr6j7saeskx6zm47sqr82j5 JRuby is a mature project that has significantly better performance for server-side apps than CRuby. Due to the Ruby-FFI efforts, it's also fairly compatible. It should be more popular, but it does have industrial use.