Voice Chat Apps
For those that prefer speaking to others using their voice instead of over text, these apps are incredibly convenient. The ability to hold voice calls over the Internet can oftentimes save a lot of money as opposed to traditional phone calls. In fact, many voice chat services are now free!
Some of the most popular free voice chat apps, such as Skype and WhatsApp, provide higher quality audio and the ability to call anyone in the world also using those services for free. It’s no wonder why Voice Over Internet Protocol (VOIP) software has become so popular on PCs and smartphones!
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- Java Mobile
Discord
All-in-one voice, video and text chat for gamers that’s free, secure, and works on both your desktop and phone.
TeamSpeak
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.
Empathy
Discontinued
Empathy is currently unmaintained. Last version, 3.25, released in August 2017, can be still downloaded from the official website.
Empathy is a messaging program which supports text, voice, video chat, and file transfers over many different protocols.
Unison
Discontinued
Unison was closed to focus on a new team chat app, FreshTeam.
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.
RetroShare
RetroShare is a open source cross-platform, private and secure decentralized communication system.
Xfire Client
Discontinued
The Xfire Client and the social site have been discontinued to focus efforts on The 
Xfire Tournament Platform
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.
Bitrix24
Some companies already use Bitrix24 for project collaboration and customer management. Tasks, chats, contacts and VoIP calls - all in one suite. Free for up to 12 users.
Rabbit
Discontinued
Rabbit will soon be shutting down due to a lack of funds. https://www.linkedin.com/pulse/hitting-wall-amanda-richardson
Rabbit is about sharing your everyday. Watch your favorite shows with your friends, without being in the same room (or even the same city!).
GameRanger
GameRanger is a free download for Mac and PC that lets you play over 600 games and demos online with friends and opponents worldwide.
Twitch Messenger
Desktop and mobile app for Twitch users to communicate with friends and teammates across platforms.
1click.io
Discontinued
1CLICK has been acquired by 
Freshdesk in August 2015
1CLICK.io is live chat application which allows you to Video, Voice and Text Chat while also Co-Browsing with visitors on your website. It has features such as call forwarding, recording and collaboration tools like screen sharing and co-browsing.
Dialog Messenger
Dialog Messenger is a customized self-hosted platform usable across multi operation systems simultaneously. dialog provides SDK tools for client interface as well as for server.
BlackBerry Messenger
Discontinued
Consumer version will be discontinued on May 31st, 2019. Business versions will continue to be supported.
The consumer version of BlackBerry Messenger will be discontinued on May 31st, 2019.
Watch2Gether
watch2gether.com is a service that allows you to watch videos in-sync together with your friends.
C3
Discontinued
C3 move to 
Overtone App https://overtone.app/
C3 is a standalone voice and text chat application built specifically for gamers for a better overall gaming experience.
CloudBerry Remote Assistant
CloudBerry Remote Assistant is a Windows software for remote control and desktop sharing. The solution is designed to quickly and securely access and control a remote desktop or server computer over the Internet.
Banckle Enterprise IM
Discontinued
It was discontinued on 15th May, 2011
Banckle Enterprise IM is a FREE and completely secure business collaboration solution for video chat, instant messaging, video call and sharing whiteboard with your team members...
Zello
The application is a push-to-talk (PTT) walkie-talkie for consumers and business and available for Android, iOS, Blackberry, Windows Phone, Windows PC, rugged mobile devices and two-way radios.
Sneek
Sneek lets you see your team mates all day by taking their snap at a regular interval. If you want to have a chat, you just click their photo and it instantly turns into video. Integrated with Slack for calls or sending snaps to any channel.