ATSim

The PlaneEnglish Air Traffic Simulator (ATSim) is an interactive air traffic control radio simulator created to enable air traffic controllers to learn and master radio communication and phraseology on their own time. ATSim provides a self-guided means to practice and master the radio through repetition and immediate feedback.
AI-based pilots interact with the controller to make requests and respond to instructions. Instantaneous feedback through voice recognition and speech analysis will guide you, the controller, through realistic scenarios toward proficiency in aviation phraseology and communication.
You can access more than 170 airports and step through lessons covering airport, terminal area, and in-transit control of VFR and IFR flights.
Guided by the Federal Aviation Administration (FAA) and International Civil Aviation Organization (ICAO) phraseology, standards, and radiotelephony procedures the current version of the simulator focuses on the FAA phraseology standards. Upcoming improvements will enable users to switch between ICAO and FAA standards.
Future releases and updates to ATSim will expand the training content, lessons, and scenarios.