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Tools

Useful resources which for the most part are free!

SANS

https://isc.sans.edu/tools/

https://www.sans.org/free

MAXMIND GeoIP

MAXMIND maintains an incredibly accurate geoip database.

https://maxmind.com/en/locate-my-ip-address

https://maxmind.com/en/geoip-demo

Hardenize

Comprehensive website configuration test built by Ivan Ristić.

https://hardenize.com/

Qualys SSL Labs

SSL/TLS testing for the browser or server.

https://www.ssllabs.com/ssltest/

Security Headers

Analyse all HTTP response headers from a website against current and emerging security best practices.

https://securityheaders.com/

Email Message Header Analyzer

Format email message headers into an easily readable format.

https://mha.azurewebsites.net

Content Security Policy (CSP) Evaluator

Test Content Security Policy (HTTP Response Header) configuration.

https://csp-evaluator.withgoogle.com

Crypto

Code-Breaking, Cipher and Logic Puzzles solving tools.

https://www.boxentriq.com/code-breaking