OpenSC - tools and libraries for smart cards
Cipherbox is a vault that utilizes six encryption algorithms.
IPsec / IKEv2-based VPN software for Linux.
A tiny, fast encryption tool in C
SES brings back the uncrackable onetime pad, with a digital twist.
An encrypter/decrypter written on the weekends
A free "on-the-fly" transparent disk encryption program for PC & PDAs.
Lite Security Module: a daemon to handle PKCS11 Secure Boxes