Be sure to get MathLib as this provides you the trig that you will want to avoid writing yourself. Their pages list programs written for the Pilot, PalmPilot or Palm III and many other systems. You may also take a look at the amazing Marek Kozubal's Portents collection of programs. His very complete and updated website lists some populars astronomy programs, with features and screenshots like the ones displayed at left, Star Pilot Plus, NGC and PocketSat. Most of them can be downloaded in a feature-limited version.
Subjects processed are stars, double stars or planets.
The program reads source files in JPG and exports star-test image in JPG format. All data measured with a laser can be converted in interferogram and auto-traced, analyzed and displayed graphically through Quick Fringe. It displays usual functions like 3D isometric plot, countour map, line profile, synthetic interferogram, aberrations data and Zernike Polynomials. Wavefront data includes RMS, P-V, Strehl ratio, Seidel aberrations and more. It is completed with a manual fringe editor able to modify points, add or delete fringe order or alter the aperture and obstruction.