EditVoicepack offers a simple interface to edit the file containing the ATC.
It brings back the all time favourite Flight Simulator ATC program.
Most seasoned pilots agree that talking to ATC just gets easier with practice.
ATC Radar Screen is a program that will allow to control a towered-airport.
Winamp-Atc is a tool to switch with one button to another (audio).
World Wide Sim
It is a radar dedicated to Air Traffic Control (ATC).
Simon's Simulation Software
The SB ATC Simulator Sector Development Kit is used to create your own sectors.
ATC Client for Real-Time virtual simulation for Air Traffic Controlling.
COMM1 Radio Simulators
COMM1: Clearances on Request is the definitive training program on ATC Departure.