I'd recommend Mirah (https://github.com/mirah/mirah https://github.com/mirah/mirah) and Pindah (https://github.com/mirah/pindah https://github.com/mirah/pindah)

I'd recommend Mirah (https://github.com/mirah/mirah https://github.com/mirah/mirah) and Pindah (https://github.com/mirah/pindah https://github.com/mirah/pindah) as an almost Ruby over Ruboto for Android due to slow startup times from the poor performance of Reflection on Dalvik.