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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.

FaceTime is a video calling software feature developed by Apple for the iOS and Mac OS.

Jitsi Meet is an OpenSource (MIT) WebRTC JavaScript application that uses Jitsi Videobridge to provide high quality, scalable video conferences.

Yahoo! Messenger is an instant messaging client developed by Yahoo! inc. for real-time communication of its users. It provides text chat, file transfer up to 2GB. conversations with audio and video, games. It also supports International Calling, Phone in Number and sending free SMS like Skype.

With ooVoo you can make free, high-quality video calls, voice calls, and send text messages to easily connect with your friends and family. Make clear and crisp video calls with up to 12 people at a time, on any device. Try it now!

What does it do:

Zoiper IAX & SIP multilanguage and multiplatform (Windows, Linux and Mac OS X) softphone is a VoIP soft client, meant to work with any IP-based communications systems and infrastructure.

dialog app is built and designed for corporate communication on all types of mobile devices - tablet, mobile phones etc.

Tkabber is a Free and Open Source client for the Jabber instant messaging system. Its writen in Tcl/Tk, and works on many platforms (tested on Linux, FreeBSD, NetBSD, Solaris, MacOS X and Windows 98/2000/XP).

Voxeet has created a new generation sound technology that makes audio conferencing for distributed groups as natural as face-to-face communications. Voxeet offers affordable, crystal clear business quality conferencing services with one touch click-to-mobile.