RepeaterBook partners with the following entities:
CHIRP is a free, open-source tool for programming your amateur radio. It supports a large number of manufacturers and models, as well as provides a way to interface with multiple data sources and formats.
Builds high-resolution maps compatible with Lowrance GPS units as well as other related Lowrance accessories. These maps and GPS accessories are catered to off-road racing, recreational 4-wheeling, and other specialized use cases for various groups.
No nonsense call sign look ups for amateur radio operators in the United States.