Certificate tools
- cloudflare/cfssl - Cloudflare's PKI and TLS toolkit
- trimstray/sslmerge - help you build a valid SSL certificate chain from the root certificate to the end-user certificate
- paranoidninja/CarbonCopy - A tool which creates a spoofed certificate of any online website and signs an Executable for AV Evasion - 用Web证书给PE签名是否合理？
- sensepost/apostille - clone X509 certificate chains
Leaked certificates abuse
Certificate Transparency
- g0ldencybersec/gungnir - a command-line tool written in Go that continuously monitors certificate transparency (CT) logs for newly issued SSL/TLS certificates
- yassineaboukir/sublert - a security and reconnaissance tool which leverages certificate transparency to automatically monitor new subdomains deployed by specific organizations and issued TLS/SSL certificate
- UnaPibaGeek/ctfr - Abusing Certificate Transparency logs for getting HTTPS websites subdomains
- certdb.com - CertDB — SSL certificates search engine
- https://developers.facebook.com/tools/ct/
- https://google.com/transparencyreport/https/ct/
- https://certstream.calidog.io/