Laravel Passport provides OAuth2 server support to Laravel
A lightweight and powerful iOS framework for intercepting HTTP/HTTPS
Easy to use cryptographic framework for data protection
A high-level OpenPGP library
Extensible security first OAuth 2.0 and OpenID Connect SDK for Go
Anti-Spam SMTP Proxy Server implements multiple spam filters
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
Full-featured C2 framework which silently persists on webserver
Java SSH API
Open Source PKI solutions