OpenCog Hyperon is a substantially revised, novel version of OpenCog - which is currently at an active pre-alpha stage of development and experimentation. One of the focuses in the Hyperon design is a successor to the OpenCog Classic Atomese language with clear semantics supporting meta-language features, different types of inference, etc. What we have landed on is an "Atomese 2" language called MeTTa (Meta Type Talk).
One can run MeTTa script from command line:
metta <name>.metta