Gearotic Motion – design pretty much any type of gear, hypocycloids, or even an entire clock, including escapements, export formats include Gcode, DXF and STL, $120.00 one off payment with lifetime free updates (also available as a bundle with GWizard Calculator from CNCCookbook). Written by the same guy who brought you Mach 3 and Mach 4 – Art Fenerty.
For a DRO I use the TouchDRO app, from Yuriy's toys on a £43.00 10.1" Android tablet via bluetooth – I built my own interface board for about £5.00 (see here and here) using the concepts on Yuriy's site to use with the Igaging scales I have on my mini mill.
Eagle from Cadsoftusa for electronic circuit design – free for personal use, PCB Gcode addon for generating Gcode to engrave PCBs using output from Eagle.
Edited By Timothy Moores on 27/04/2016 09:16:49