Security and Privacy

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• The GNU Privacy Guard   
  GnuPG is a complete and free replacement for PGP. Because it does not use the patented IDEA algorithm, it can be used without any restrictions. GnuPG is a RFC2440 (OpenPGP) compliant application. GNU General Public License
  
  http://www.gnupg.org/

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• The GNU Privacy Handbook   
  GnuPG Manual. GnuPG is a tool for secure communication GNU. Under Free Documentation License.
  
  http://www.gnupg.org/gph/en/manual.html

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• Mac GNU Privacy Guard   
  Mac GNU Privacy Guard (Mac GPG for short) is, after a fashion, the Mac OS X port of GnuPG, licensed under the GNU GPL.
  
  http://macgpg.sourceforge.net/

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• Seahorse   
  Seahorse is a GNOME application for managing PGP keys.
  
  http://seahorse.sourceforge.net/

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• KGPG   
  KGPG is a simple, free, open source KDE frontend for GPG.
  
  http://developer.kde.org/~kgpg/index.html

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• mod_SSL   
  Strong cryptography for the Apache 1.3 webserver via the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security v1 protocols by the help of the Open Source SSL/TLS toolkit OpenSSL. BSD-style license.
  
  http://www.modssl.org/

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• The OpenSSL Project   
  Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols as well as a full-strength general purpose cryptography library. Apache-style license.
  
  http://www.openssl.org/

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• DansGuardian   
  DansGuardian is an award winning web content filtering proxy for Linux, FreeBSD, OpenBSD, NetBSD, Mac OS X, HP-UX, and Solaris that uses Squid to do all the fetching.
  
  http://dansguardian.org/

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• CAcert.org   
  CAcert.org is a community driven, Certificate Authority that issues certificates to the public at large for free.
  
  http://www.cacert.org/

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