Lua is a lightweight and fast scripting language. It may be used standalone or be embedded into applications. MorphOS port of the language adds to the modularity having the core interpreter and all standard modules implemented as shared system libraries. The port features also LuaX (standalone script executor) and LuaExplorador (MUI based source level debugger). Full developer material included (header files and documentation). Version 0.4 brings io.module, which adds file operations to the language. Unlike straightforward ports, this one interfaces to dos.library directly, bypassing unnecessary layers of unix environment emulation. The package is available in the download section.