An instant messaging app that provides online text message and video chat services.

Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free. It is like SMS, but more powerful.

WhatsApp Messenger is a cross-platform mobile messaging app which allows you to exchange messages without having to pay for SMS.

All-in-one voice, video and text chat for gamers that’s free, secure, and works on both your desktop and phone.

OpenVPN is a full-featured open source SSL VPN solution that accommodates a wide range of configurations, including remote access, site-to-site VPNs, Wi-Fi security, and enterprise-scale remote access solutions with load balancing...

TextSecure and RedPhone have been merged to create Signal! Using Signal, you can communicate instantly while avoiding SMS fees, create groups so that you can chat in real time with all your friends at once, and share media or...

Mumble is an open source, low-latency, high quality voice chat software primarily intended for use while gaming.

Viber is a mobile application that lets you make free phone calls and send text messages to anyone who also has the application installed. .

Jitsi (previously SIP Communicator) is an audio/video and chat communicator with full end-to-end encryption that supports protocols such as SIP, XMPP/Jabber, ICQ/AIM, Windows Live, Yahoo!, GTalk/Hangouts extensions, as well as OTR, ZRTP...

Riot (formerly Vector) is an opensource interoperable app running on Web, iOS and Android.

Wire is a secure and private messenger for phones, tablets and desktop. Crystal clear voice and video calls, private group chats, file sharing, audio and video messages - everything is end-to-end encrypted.

With this plugin by Google, you can now use voice and video capabilities in your Gmail, iGoogle and orkut chat. It lets you have an actual conversation with someone, or even chat face to face over video.

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.

Empathy is a messaging program which supports text, voice, video chat, and file transfers over many different protocols. You can tell it about your accounts on all those services and do all your chatting within one application.

Nimbuzz offers limited availablility free calls and limited availability free text messaging for users via 3G and WiFi. Calls to other Nimbuzz users are free. PAY to call mobile or landline phones for as little as $0.

Unison is for business: a fast messenger and group collaboration tool that lets teams work much more quickly together, especially across different locations and time zones. It syncs instantly across your smartphone, tablet, or computer.

Voice, video and chat communications, secure, decentralized, strong privacy and freedoms.

Linphone is an internet phone or Voice Over IP phone (VoIP). With Linphone you can communicate freely with people over the internet, with voice, video, and text instant messaging.

Matrix is an open standard for decentralized persistent communication over IP. It can be used for decentralised group chat, WebRTC signaling, IoT-data transfer, and generally to link together fragmented silos of communication.

RetroShare is a open source cross-platform, private and secure decentralized communication system. It lets you to securely chat, share photos, videos, and more, using https://alternativeto .

LINE is a Japanese proprietary application for instant messaging on smartphones and PCs. Line users exchange text messages, graphics, video and audio media, make free VoIP calls, and hold free audio or video conferences.

Xfire is a free IM application and a tool that automatically keeps track of when and where gamers are playing PC games online and lets their friends join them easily.

FaceTime is a video calling software feature developed by Apple for the iOS and Mac OS. FaceTime makes it possible to talk, smile, wave, and laugh with anyone on an iDevice or Mac over Wi-Fi.

Ekiga (formely known as GnomeMeeting) is an open source VoIP and video conferencing application for GNOME. Ekiga uses both the H.323 and SIP protocols.

Fring is a VoIP (voice over internet) app that allows you to make 2-way video calls, voice calls and live chat for free, from your phone or iPod.