Opendata.rapid7.com
Offering researchers and partners access to data from Project Sonar, which conducts internet-wide surveys to gain insights into global exposure to common vulnerabilities.
Finding SSL Certificates
Internet-Wide Scan Data Repository
The Stanford Internet Research Data Repository is a public archive of research data about the hosts and sites on the Internet.
Ates.com
Google Transparency Report
Cert Spotter API
GitHub - lanrat/certgraph: An open source intelligence tool to crawl the graph of certificate Alternate Names
An open source intelligence tool to crawl the graph of certificate Alternate Names - GitHub - lanrat/certgraph: An open source intelligence tool to crawl the graph of certificate Alternate Names
Amar- GitHub
Amar- has one repository available. Follow their code on GitHub.