Optimage - Advanced image optimization tool

µlogger - µlogger [micro-logger] is an android application for continuous logging of location coordinates, designed to record hiking, biking tracks and other outdoor activities. This app works with a self-hosted server

Piio - Generates responsive images so you don't have to optimize

GPSLogger - A battery efficient GPS logging application.

EOS Fitness - EOS Fitness is a dynamic platform that provides the best solution for peoples’ mental and physical health.

PhoneTrack - Nextcloud app to create tracking sessions to display phones position in real time and export activity to gpx.