https://www.glidernet.org/

The objective of the Open Glider Network is to create and maintain
a unified tracking platform for gliders, drones and other aircraft. Focused on
tracking aircraft equipped with FLARM and OGN trackers, OGN is also open for
integrating of other data sources (e.g. PilotAware, SPOT, FANET (paragliders),
Spidertracks, …)

The tracking data is freely available to anyone as long as they follow OGN data
usage rules.

https://www.glidernet.org/ogn-data-usage/

OGN Architecture

Today FLARM is mainly utilized in gliders, however other small aircraft (planes,
helicopters, deltas, para-gliders or even drones) are more and more often
equipped with it, especially if operating in the areas intensively used by
gliders, such as the Alps. Contrary to FLARM, OGN proposes an open transmission
protocol and has an ambition to influence (or better) impose a standard.

The OGN is a community project. It is based on software, hardware, receivers and
other contributions from individuals and the open source community.

The OGN network consists of:

APRS linux based servers that receive and forward data. Data includes device
location information, status of receivers and the status of the OGN APRS
network.

A device database (aircraft). Register your aircraft/drone with tracking device
in the OGN device database here if you wish to influence the way how it’s going
to be visible in the system (anonymous vs recognized).

OGN ground receivers, based at airfields, gliding clubs, summits of mountains or
private houses of our community members. They listen and decode the location
data of aircraft in their vicinity and send position reports via network to the
APRS servers.

Software for Linux that can be installed on a PC or small mini-board computers
(such as the Raspberry Pi, Cubieboard2, Odroid U3, etc.). It drives a USB DVB-T
radio receiver and listens for, decodes, sends the position reports and
participates in the OGN network.

Websites and applications that can use and display the data. The most obvious
use is to track aircraft on a moving map in real time, another use would be
search and rescue (SAR), automatic flight logs, etc.

https://www.fai.org/news/OGN-wins-EASA-award

The European Union Aviation Safety Agency (EASA) has recently
announced that the first prize of the General Aviation Safety Award has been
awarded to Sébastien Chaumontet for the Open Glider Network (OGN). This award
recognises the smartphone/tablet applications that bring the most safety
benefits for pilots.