30 cybersecurity search engines for researchers (Daniel Kelley)

He's just posted a list of 30 cybersecurity search engines for researchers. Ok, Researchers may find value in using these tools based on their specific needs and objectives, such as threat intelligence, vulnerability scanning, DNS analysis, data leaks, and more.
Here's my personal feedback: I would rather rank WayBackMachine higher (which enables viewing content from deleted websites through web archives) and rank DorkSearch a bit lower.
What are your opinions on this list?

1. Dehashed—View leaked credentials.
2. SecurityTrails—Extensive DNS …

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