A atlernative SSL/TLS online test tool to check compliance with PCI-DSS
testssl.sh is a free command line tool which checks a server's service on any port for the support of TLS/SSL ciphers, protocols as well as recent cryptographic flaws and more.
bettercap is a complete, modular, portable and easily extensible MITM tool and framework
This is a commercial managed URL blacklist service.
It is a penetration testing tool that focuses on the web browser.
It is an open-source Python-driven tool aimed at penetration testing around Social-Engineering.
HTTPS certificate chain check if weak sha-1 cipher is used
A curated list of resources for learning about application security - focused on PHP
List and how tos for activating two-factor-authentication for popular public websites