Calculator

http://prusaprinters.org/calculator/

Raspberry Pi CNC

http://wiki.protoneer.co.nz/Raspberry_Pi_CNC

Raster to G-code

• lw.raster-to-gcode - Raster to G-Code for LaserWeb.
• lw.rasterizer - Bitmap to GCode for the LaserWeb project.

Simple LinuxCNC G-Code Generators

https://github.com/LinuxCNC/simple-gcode-generators