Apps similar to Subfinder include OWASP Amass, which is free and open source. Other options are Sublist3r, SubdomainRadar, Anubis Subdomain enumeration and Lepus Subdomain finder. In total there are five apps like Subfinder for the web, self-hosting and Linux.
The OWASP Amass Project has developed a tool to help information security professionals perform network mapping of attack surfaces and perform external asset discovery using open source information gathering and active reconnaissance techniques.
Discover hidden subdomains with unparalleled speed and precision. SubDomainRadar.io is the ultimate subdomain finder and lookup tool for cybersecurity professionals, bug hunters, and pentesters, offering advanced enumeration through exclusive data sources and real-time search capabilities.
Anubis is a subdomain enumeration and information gathering tool. Anubis collates data from a variety of sources, including HackerTarget, DNSDumpster, x509 certs, VirusTotal, Google, Pkey, and NetCraft.
Lepus is a utility for identifying and collecting subdomains for a given domain. Subdomain discovery is a crucial part during the reconnaissance phase.
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