Machinist Mate is a collection of all purpose fabrication tools.
This is what the app currently has to offer specifically for machinists:
Speeds Calculator in metric and standard.
Feeds Calculator in metric and standard.
CNC Codes - all the common G and M codes as well as the Letter Address.
These are the all purpose additions:
Conversions - Length and Volume as always in metric and standard.
Geometry - Right Triangle, Obtuse Triangle, Square, Circle, Trapezoid/Trapezium(for those in the UK), Parallelogram and Rectangle.
Reference - Metric to Standard wrench conversions, for when you need a standard but you only have a metric, it shows you how close in size they are to each other. Also in the Reference section is a drill chart; complete with wiregauge, standard, metric and letter sizes.