Top 4 gpsd open source projects

Read GPS data from a PiZero in a single page web app via a WebSocket

Simulate a simple GPS device with gpsd or geoclue2

GPSd client library written in Java

Utilities for Raspberry Pi, mostly for usage on a boat. Includes UART control scripts, traffic measurement tools for Mikrotik (RouterOS) and OpenWrt, AIS wireless daemon, AIS decoder and an extensible boat & IoT sensor daemon for Signal K.