cross-platform (Java) file encryption and archiving tool
PGP graphical user interface
For full, incremental, compressed and encrypted backups or archives
binary encryption archiver
UFONet - Denial of Service Toolkit
Robust and flexible VPN network tunnelling
The safest way to store private data in untrusted (cloud) environments
yubikey-agent is a seamless ssh-agent for YubiKeys
Mkpass - Command line Secure Password Generator
Halimede Certificate Authority
Compiled into a single .jar file. Tiny Password Manager. Portable
Encryption addressing long-term data secrecy
Decrypt messages encrypted with a substitution cipher
jEncrypt is a command line file encryption archiver
pythonic kerberosish ticket system: easy to use, easy to subclass