Gpsd
- gpsctl(1) control the modes of a GPS
- gpsd(8) interface daemon for GPS receivers
- gpsdctl(8) tool for sending commands to gpsd over its control socket
- gpsinit(8) initialize CAN kernel modules for GPSD
- ntpshmmon(1) capture samples from gpsd or other ntpd refclock sources
- ppscheck(8) tool to check a serial port for PPS
- ubxtool(1) u-blox tool