GnuPG 2.2, 2.3 and 2.4 distributions for OS X / macOS
Encrypted volumes through command line
IPsec / IKEv2-based VPN software for Linux.
Modular Digestion Tool
An encrypter/decrypter written on the weekends
A tiny, fast encryption tool in C
SES brings back the uncrackable onetime pad, with a digital twist.
A free "on-the-fly" transparent disk encryption program for PC & PDAs.
Cracker-ng is a multiple file password finder.