Laravel Passport provides OAuth2 server support to Laravel
A lightweight and powerful iOS framework for intercepting HTTP/HTTPS
A high-level OpenPGP library
Extensible security first OAuth 2.0 and OpenID Connect SDK for Go
Easy to use cryptographic framework for data protection
UNiform Interface to COmputing and data REsources
Wapiti is a web-application vulnerability scanner
PHP strong authentication library, web interface & CLI, OATH certified
Strong Email & Apache Log Analysis with Active Security Features
Java SSH API
password safe / manager for linux and windows (and mac ?) via qt
Encrypting, anonymous, unlimited size message transfer system
Two-factor authentication system
partitioning backup recovery and all kind of boot loaders