Pluto
A superset of Lua 5.4 — with unique features, optimizations, and improvements.
New Syntax
Pluto implements various popular syntaxes that are absent in Lua.
Optimizations
Pluto is slightly faster than Lua, but in some instances by a pretty large margin.
Larger Standard Library
Pluto aims to meet the standard library of Python, and is slowly encroaching this goal.