Name

URL

Comment

SSL/TLS Test

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

SSL/TLS Test

https://ssl-tools.net/

HTTP headers Test

https://securityheaders.com/

IPLeak

https://ipleak.net/

Show what you are leaking

IPX

https://ipx.ac/run

Gives all the information about your browser

Subdomain finder

https://subdomainfinder.c99.nl/

Find hidden subdomains