Nikto is described as 'Open Source (GPL) web server scanner which performs comprehensive tests against web servers for multiple items, including over 6400 potentially dangerous files/CGIs, checks for outdated versions of over 1000 servers, and version specific problems on over 270 servers' and is a vulnerability scanner in the security & privacy category. There are more than 10 alternatives to Nikto for a variety of platforms, including Windows, Web-based, Linux, Mac and SaaS apps. The best Nikto alternative is Zed Attack Proxy (ZAP), which is both free and Open Source. Other great apps like Nikto are Lonkero, wapiti, w3af and Acunetix.