Ventrilo is a Voice over IP (VoIp) software that includes text chart. The program was released on August 3, 2002 by developer Brian Knapp. The program can be installed in Mac OS X, Microsoft Windows, Linux, and other variants of Unix (Server). The software is licensed as Proprietary Freeware. Users can rent a hosting server and then connect to Ventrilo using hosting address and login information from the rented server. Users can create many channel within the hosting server and share the login information with their friends so they can join the channel and communicate with each other. Ventrilo currently supports GSM Full Rate and Speedx as their main codecs.