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OpenSSL - OpenSSL is a free and open source software cryptography library that implements both the Secure Sockets Layer (SSL) and the Transport Layer Security (TLS) protocols, which are primarily used to provide secure communications between web browsers and …
Dead Link Checker - Check for broken links on any website
Let's Encrypt - Let’s Encrypt is a free, automated, and open certificate authority brought to you by the Internet Security Research Group (ISRG).
BrokenLinkCheck - Free Broken Link Checker / Online Dead Link Checking Tool - find bad hyperlinks
Ensighten - Ensighten provides enterprise tag management solutions that enable businesses manage their websites more effectively.
LinkChecker - LinkChecker is a free, GPL licensed website validator.