Ventrilo!

All-in-one voice and text chat for gamers that’s free, secure, and works on both your desktop and phone. Stop paying for TeamSpeak servers and hassling with Skype.

Mumble was the first and is the most successful and wide spread free and open source software for VoIP. It was the first VoIP software to provide low-latency audio suitable for gaming, and at the same time was a pioneer in high audio quality at the same time.

TeamSpeak is a proprietary Voice over IP software that allows users to speak on a chat channel with other users, much like a telephone conference call. A TeamSpeak user will often wear a headset with an integrated microphone. Users use the TeamSpeak client software to connect to a TeamSpeak server of their choice, from there they can join chat channels.The target audience for TeamSpeak is gamers, who can use the software to communicate with other players on the same team of a multiplayer game. Communicating by voice gives a competitive advantage by allowing players to keep their hands on the controls. »

Formerly known as Curse, Twitch Messenger (also Twitch Desktop App) was acquired by Twitch and rebranded as the desktop and mobile app for Twitch-based messaging. It's a fast, secure and free communications app for and by gamers.

Zello (formerly loudtalks) the fastest way to communicate online. Don't type or call — just push F7 and speak! Reply, when convenient, talk to all people in a group at once or anyone individually, re-play the entire conversation later from voice history. It works on Blackberry, iPhone, Android and Windows Mobile devices too.

Free live webcam video chat room software for multiple desktop platforms including mobile platforms like iOS and Android.

GameVox provides group voice communications for gaming communities.

FaceFlow is a free web-based application for video calling and group video calling. It also offers additional features such as chat rooms.

Chatzy is a free private chat service which you can use to communicate with people you already know or people who visits your blog or website. With Chatzy you can create a chatroom and send out email invitations very quickly and easily. No registration is required.