Discord, Viber, Mumble, Walkie-Talkie.io, Spacebar, Jitsi Desktop, ReaLiveT, Steam Chat, Phoner Second Phone Number, Guilded, Dolby Axon, p2p.chat, Roger Wilco, Ventrilo, RaidCall, ToTok, Lifesize Video Conferencing, Element X, Touchbase, Cyanide, pttdroid, STAGE by vr-on, GameVox, TeamTalk, Sound Branch, Razer Comms, Meeet.at, Subrosa, VoiceChatter, Kweknet, Curse Voice, Mohawk Voice, link4.chat are some alternatives to TeamSpeak.