EuroScope (ES) is currently the most popular ATC client on the network, it is customizable and designed to simulate real-life radar software. It also features an innovative display, automatic controller coordination and a built-in simulation system.
AFV is a brand new voice system, built from the ground up with the aims of improving the clarity and intelligibility of VATSIM voice communications, minimizing latency and increasing realism.
vPilot is a simple, effective client designed to get new pilots flying quickly with excellent model matching so that you can see other online pilots with the correct aircraft type and livery. vPilot is probably the best choice for new members that use FSX or P3D because it is quick and easy to install and get started with.
Swift is a new pilot client for VATSIM currently undergoing open beta testing. It is compatible with all the main pilot clients and several operating systems. It is a feature-rich client but the instructions must be read. Standalone client of AFV is required.