SSL Checkers

https://certlogik.com/ssl-checker

https://crt.sh

https://testtls.com

https://www.ssllabs.com/ssltest

https://www.wormly.com/test_ssl

https://www.digicert.com/help

https://www.immuniweb.com/ssl

https://www.sslshopper.com/ssl-checker.html

https://tls.imirhil.fr

https://aboutssl.org/ssl-tools/ssl-checker.php