flightjar

A self-hosted Mode S/ADS-B receiver UI: connects to a BEAST feed (readsb / dump1090-fa), decodes ADS-B + Comm-B (BDS 4,0 / 4,4 / 5,0 / 6,0), and serves a Leaflet map with per-aircraft details, routes, photos, METARs, terrain blackspots, polar coverage, traffic heatmap, and watchlist alerts (Telegram / ntfy / webhook), with aggregated flights. Maintained by MrSuttonmann on GitHub, where it has earned 55 stars from the community.

It's actively developed around flight-tracker, live-map, readsb, and is a solid reference for anyone building with these tools.