Skipfish is an active web application security reconnaissance tool. Developed by google
License: Open Source
Nikto is an Open Source (GPL) web server scanner which performs comprehensive tests against web servers for multiple items, including over 6700 potentially dangerous files/programs, checks for outdated versions of over 1250 servers, and version specific problems on over 270 servers. Developed by Chris Sullo and David Lodge
License: Open Source
Skipfish is primarily designed for fast and efficient active web application scanning with a user-friendly interface, making it ideal for quick assessments. In contrast, Nikto offers comprehensive scanning capabilities, especially for web servers, with a focus on identifying a wide range of vulnerabilities, but may require more time and complexity to set up.