If you are looking for an alternative to Skype its worth checking out Brosix!
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www.brosix.comIt's available for Windows,Mac,iPhone/iPad,Android and Linux.
Features include - text chat,file transfer,screen sharing,screen sharing,whiteboard,voice calls and video calls,etc....
Brosix encrypts all the traffic with 256-bit AES keys. Instant messages,File Transfers,Voice Chats,Video Chats,screens,etc are encrypted and only the recipient users can decrypt and use or see them.
Skype used to be encrypted until Microsoft bought them as you all know.....
This is NOT a US company!!