I maintain a few software projects.
Add Hours and Minutes
Add Hours and Minutes is a simple calculator app that adds times given in hours and minutes. It helps with the recording of machine running times, or with the addition of flight times in your pilots’ flight log. The program is available for mobile phones, for desktop computers, and will run inside your web browser.
Elliptic Curve Plotter
The Elliptic Curve Plotter is a graphical application that illustrates elliptic curves. Users can sketch elliptic curves and experiment with their group law. Images can be saved in PNG or SVG format for later use. The program is available for desktop computers. A restricted version will run inside your web browser.
Enroute Flight Navigation
Scantools is a library and a matching set of command line programs for manipulation of graphic files, written with a view towards handling of scanned documents.