Short bio: Computer Scientist, FOSS supporter (read more)
Tux Machines (TM)-specific
Skype is without doubt one of the best proprietary software available to Linux users. However, ever since Microsoft acquired it, some people have started looking for free and open-source alternatives to the popular communication (Voice over Internet Protocol, instant messaging, videoconferencing) software.
Let's take a close look at some of the best choices you have if you were to quit using Skype today. So without further delay, here are some of the best free and open-source Skype replacements (in no particular order) especially for those of you who are using Linux:
Ekiga, formerly called GNOME Meeting is a VOIP and video conferencing application that works across Linux and Windows. It includes many great features like USB hotplug support, Contact list, Basic instant messaging, video calling, call transfer, call forwarding and more.