Looking for an API like builtwith.com (let's you know what technology is behind website), but one that's opensource, or at least is more startup friendly ....

• Sublist3r

  12 9,243 0.0 Python

  Fast subdomains enumeration tool for penetration testers

That said, keep in mind that not everything is going to find its way indexed in Google. If it's subdomains you're after, you can use tools like Sublist3r or Sudomy to pull data from multiple sources (not just DNS).

• Sudomy

  3 1,847 2.2 Shell

  Sudomy is a subdomain enumeration tool to collect subdomains and analyzing domains performing automated reconnaissance (recon) for bug hunting / pentesting

That said, keep in mind that not everything is going to find its way indexed in Google. If it's subdomains you're after, you can use tools like Sublist3r or Sudomy to pull data from multiple sources (not just DNS).

• InfluxDB

  www.influxdata.com sponsored

  Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.

  

• wappalyzer

  80 8,373 9.8 JavaScript

  Discontinued Identify technology on websites.

  

• spiderfoot

  19 11,723 6.6 Python

  SpiderFoot automates OSINT for threat intelligence and mapping your attack surface.

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