CalX

You can code advanced scientific calculations with basic knowledge of Lua scripting, but if you want run more complex tasks you can use all of available Lua functions.
You can draw any of programmed functions on the screen and even play them.
Also, if you want to learn Lua you can make it by running included example files and reference manual.
Lines numbering, syntax highlighting and errors managing also help in your work.
Version of Lua: 5.3.