Zabbix - Track, record, alert and visualize performance and availability of IT resources
Mobile Topographer Free - Mobile Topographer Free app provides features through which users can mark their properties right on the mobile phone screen.
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
GPS Waypoints - GPS Waypoints is an app by Bluecover Technologies that comes up with features to help you in becoming a professional surveyor by taking a survey of the land for planning as well we for entertainment purposes.
Prometheus - An open-source systems monitoring and alerting toolkit.
Lefebure NTRIP Client - Lefebure NTRIP Client app offers features to lets you connect to a large number of high accuracy GPS, GNSS, DGPS, or RTK in order to lo all your NMEA position data to your mobile phone’s internal storage.