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Skype

Skype is VOIP and instant messaging software that allows voice and chat communication between computers and phone systems via the internet. Direct computer to computer via the internet is free of charge, and computer to phone connections via the internet have a relatively small fee. Additional features include video conferencing and file transfer. Acquired by Microsoft in May 2011.

Technical Expertise Required: 
No programming
Cost: 
Free
Additional Information: 

Basic software installation and computer to computer calling is free. Additional features incur a charge.

Platform: 
Cross-platform