OpenGGD (Open GPS Gateway and Database) aims to be a solution for centralizing vehicle fleet GPS information, acting as an interface among different GPS devices or their control programs and different GIS programs. OpenGGD is mainly a GPS database infrastructure. It is neither a program for controlling GPS devices nor a mapping tool.
fastgps is a fully functional GPS software receiver which demonstrates all the steps performed in a GNSS navigation receiver. This receiver includes: an FFT acquisition; code and carrier tracking; pseudorange measurements; navigation data decoding; and position, velocity, and time estimation functions. The software receiver is also capable of using external aiding data from the International GNSS Service (IGS) as well as applying WAAS differential ionosphere corrections.