GPSTest (Google Play, F-Droid, Source code) - Supports dual-frequency GNSS for GPS, GLONASS, QZSS, BeiDou/COMPASS, Galileo, IRNSS, as well as various SBAS systems. Supports measuring accuracy using a ground truth location and file logging for NMEA, raw measurements, navigation messages, and location data. Logs are compatible with Google's GPS Measurement Tools suite to visualize data.

GNSS Compare (Google Play, Documentation, Source code) - Supporting calculating positions from raw measurements for GPS and Galileo. Beta support for dual-frequency.

Sat Stat (F-Droid, Source code) - Android Location, Sensor and Radio Network Status.

GNSSLogger (Source code) - Log raw measurements for visualization in Google's GPS Measurement Tools suite.

RTKGPS+ (Google Play) - Android frontend of RTKLIB.