The program "Satellite Antenna Alignment" is used to calculate the angles necessary for installing satellite dishes. The main difference from similar software is the possibility to calculate the position for all satellites at once. Thus, you get a clear picture about what satellites can be physically visible from the location where the dish will be installed. Additionally, the program has a mechanism for calculating the azimuth of the sun.

Cantennator calculates dimentions for a can WiFi antenna. You enter the can diameter, and it will calculate where to drill the hole for the connector as well as the optimum can length. Boost your WiFi signal with this cheap and easy to make antenna. Freeware.