/bin/bash based SSL/TLS tester: testssl.sh

Maximum Lifespan of SSL/TLS Certificates is 398 Days Starting Today

How to Create Your Own SSL Certificate Authority for Local HTTPS Development

AWS's implementation of TLS/SSL

An SSL cert that is valid for any and all domains and all levels of subdomains

Spyware inside Unity is trying to phone home to a website with an expired SSL

How SSL Kill Switch works on iOS 12

Dissecting an SSL Certificate

A note about SSL/TLS trusted certificate stores, and platforms (OpenSSL and GnuTLS) (2015)

SSLChecker is a tool to identify obsolete versions of SSL/TLS