TopoDraw

"TopoDraw allows you to draw new waypoints and tracks directly onto a 2D map simply by pointing and clicking. You can also use TopoDraw to present navigation data gathered with your Garmin GPS unit on a 2D map. You can turn any graphics file into a map for use with TopoDraw. Use any jpeg, gif, tiff or pict that you find on the internet, export from a CD-ROM atlas, or scan from a real topographical map.

TopoDraw integrates support for Link2GPS. You can upload data created with TopoDraw directly to your GPS unit with Link2GPS, and you can drag and drop navigation data directly from Link2GPS onto a TopoDraw map. "

Physics 101 SE

"Demonstrated by Apple's own Phil Schiller this is the perfect solution for physics students and teachers everywhere, Physics 101 SE is the premier physics calculation tool, allowing you to focus on physics and not mathematical tedium. With its ability to instantly solve for almost any variable in over 125 of the most commonly used formulas organized within twenty-three sections, and the ability to solve for variables within most of those formulas you will quickly get through problems."

AstroGrav

"It is a program that allows you to study how astronomical objects move and interact under the force of gravity. It features superb interactive 3D graphics which allow you to move around within an astronomical system that you are viewing, while watching how it evolves with the passage of time. A wide variety of sample files are provided, including Solar System, space mission and abstract systems, and these enable you to experiment with AstroGrav without having to go to the trouble of entering your own data. The comprehensive editing facilities allow you to either create your own astronomical systems or to modify existing ones, and provide you with an almost endless scope for experimentation and investigation."