As a successor of the GPMD2CSV tool, Telemetry Extractor Lite inherits all the data extracting capabilities with an online interface that works on any operating system. It can export GPMF data to many formats, including JSON, CSV and GPX.

https://goprotelemetryextractor.com/free/

Progressively, many features have been added to the tool:

• Extract data from any sensor, not just GPS, accelerometer and gyroscope
• Data filtering
• Data visualization (graphs and maps)
• Export to After Effects MGJSON format
• And more