Public api for aircraft, airlines, and flight routes. No API key, everything is rate limited over a 60 second period.
I don't know how useful or reliable it is yet.
Aircraft owners or designated representative may request limiting aircraft data displayed (formally referred to as blocking) or unblocking of flight tracking data. Limiting aircraft data from the FAA data systems will limit flight tracking information transmitted over the Internet. “Unblocking” will ensure aircraft flight data will be included in the FAA data feed utilized by internet flight tracking vendors.
A personal, open source air traffic map. Designed for use on boxen that are RTL-SDR enabled, monitoring ADSB traffic, and are running a web server. Connects to the network port of dump1090-fa, readsb, dump1090, dump1090-mutability, or skyaware978 for its data. All-in-one installation script. Implemented with a shell script.