Ferro is a Lua implementation for Java, designed for use in the Minecraft mod OpenComputers: Reanimated. It is based on OC-LuaJ, which in turn is based on LuaJ 3.0.2.
Bad idea.
No, seriously. That's a very bad idea. Ferro is being developed specifically to meet the needs of OpenComputers: Reanimated, and there are no guarantees it will work in other projects. If you really want Lua on the JVM, you should look into the original LuaJ and JNLua.