ZoomEye is described as 'search engine for Cyberspace' and is an website in the Online Services category. There are more than 10 alternatives to ZoomEye, not only websites but also apps for a variety of platforms, including Linux, Windows, Mac and Self-Hosted solutions. The best alternative is Metasploit. It's not free, so if you're looking for a free alternative, you could try Shodan or Censys. Other great sites and apps similar to ZoomEye are Armitage (Free, Open Source), Social-Engineer Toolkit (Free, Open Source), Exploit Pack (Free, Open Source) and Cobalt Strike (Paid).
A search engine which collects, processes, and provides structured information about network elements using an OSINT techniques. Provides detailed info on the following elements: DNS, AS, IPv4 Hosts, Ports, Banners, Digital Certificates, and more.
LeakIX is a search engine indexing open hosts on the internet. It focuses on listing the databases and table names and keeps an history of every successful connection. New database software support is added on a regular basis.