TrueCrypt is free open-source disk encryption software for Windows, Mac OS X and Linux. In case an attacker forces you to reveal the password, TrueCrypt provides plausible deniability. In contrast to file encryption, data encryption performed by TrueCrypt is real-time (on-the-fly), automatic, transparent, needs very little memory, and does not involve temporary unencrypted files.
Cryptocat lets you chat with privacy. Easy to use web app that encrypts your conversations. It's open source and you already know how to use it.
ProXPN. The easiest to use free VPN. Quickly secure your internet connection and unblock any website. Works with PCs, Macs, iOS, Android, and more.
Tor is free software and an open network that helps you defend against a form of network surveillance that threatens personal freedom and privacy, confidential business activities and relationships, and state security known as traffic analysis.
BitTorrent Sync. Automatically sync files via secure, distributed technology.
Join Mozilla, the EFF, Free Press, Access, Demand Progress and others in asking Congress to restore our rights to privacy.