GnuPG_PGP

TrueCrypt : Open-Source Disk Encryption Software for Windows and Linux TrueCrypt is an excellent open source disk encryption system. Users can encrypt entire filesystems, which

OpenVPN : A full-featured SSL VPN solution OpenVPN is an open-source SSL VPN package which can accommodate a wide range of configurations, including remote access,

Stunnel : A general-purpose SSL cryptographic wrapper The stunnel program is designed to work as an SSL encryption wrapper between remote client and local (inetd-startable)

Tor : An anonymous Internet communication system Tor is a toolset for a wide range of organizations and people that want to improve their safety

OpenSSL : The premier SSL/TLS encryption library The OpenSSL Project is a collaborative effort to develop a robust, commercial-grade, full-featured, and open source toolkit implementing