SSL/TLS Testing Tools

Link

Description

badssl.com is meant for manual testing of security UI in web clients.

If you want to see client certification authentication in action, use the following:
In order for this test to work you must first install the client certificate on to your system (get it here: Certificate Downloads — badssl.com).

After you install the certificate, visit https://client.badssl.com/ at which point you should be prompted to select a certificate that you’d like to authenticate with. Your only option should be the certificate you have just installed.

This free online service performs a deep analysis of the configuration of any SSL web server on the public Internet.

How's My SSL? is a cute little website that tells you how secure your TLS client is. TLS clients just like the browser you're reading this with.