Spybusters Tip #631 - Top Four Anti-Surveillance Apps

...as reported by Violet Blue for Zero Day.
Text Secure (play.google.com)
TextSecure encrypts your text messages over the air and on your phone. It's almost identical to the normal text messaging application, and is just as easy to use.

Red Phone (play.google.com)
RedPhone provides end-to-end encryption for your calls, securing your conversations so that nobody can listen in.

Onion Browser (Apple iTunes)
Onion Browser is a minimal web browser that encrypts and tunnels web traffic through the Tor onion router network and provides other tools to help browse the internet while maintaining privacy. 

Orbot (play.google.com)
Orbot is a "proxy app that empowers other apps to use the internet more securely. It uses Tor to encrypt Internet traffic and hide it by basically bouncing through a series of computers around the world; it is the official version of the Tor onion routing service for Android. (more)