Jitsi

Jitsi is an open source videoconferencing service that protects your privacy and keeps you from being spied on.

This chat, VoIP, telephone, and videoconferencing service encrypts all the information sent between the two or more participants in the videoconference. This will keep people from trying to hack into or secretly access your information.

With Jitsi, you can make audio or video calls, record messages, and send group chats to your contacts. All this is encrypted and coded using OTR technology.

Another great thing about this tool is that it's compatible with ICE and TURN protocols. Also, it suppresses background noise and echo in order to improve the quality of the call and allow for clear conversation without interference.

In addition to encrypting your messages and calls, Jitsi secures the privacy of your information and passwords with a master password. The program is also perfect for linking up to your favorite social networks (Google Talk, Facebook, XMPP, and SIP).