Ship Propulsion LT is an android application that estimates ship resistance and required propulsion power for required speed.
It currently supports Holtrop & Mennen's method for ship resistance and engine power estimation.
The application will be released as soon as I make it a little more visual.
If you don't want to wait, please follow this link to join beta testers.
You may also like my yPlus Calculator app - a must have tool for CFD engineers.