PunkSPIDER is described as 'Global-reaching web application vulnerability search engine. The goal is to allow the user to determine vulnerabilities across the Internet quickly, easily, and intuitively' and is a vulnerability scanner in the online services category. There are seven alternatives to PunkSPIDER, not only websites but also apps for a variety of platforms, including Linux, Mac, Windows and Self-Hosted apps. The best PunkSPIDER alternative is Shodan, which is free. Other great sites and apps similar to PunkSPIDER are Censys, ZoomEye, IVRE and Grabber Web Application Scanner.
Shodan is a search engine that lets you find specific computers (routers, servers, etc.) using a variety of filters. Some have also described it as a public port scan directory or a search engine of banners.
Censys is a search engine that allows computer scientists to ask questions about the devices and networks that compose the internet.
Grabber is a web application scanner. Basically it detects some kind of vulnerabilities in your website.
Vega is a free and open source scanner and testing platform to test the security of web applications. Vega can help you find and validate SQL Injection, Cross-Site Scripting (XSS), inadvertently disclosed sensitive information, and other vulnerabilities.
Natlas is an open source project designed to provide scalable network scanning and an interface to search through the results. For more information, visit github.com/natlas/natlas
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