1. Honeynet project.
https://www.honeynet.org/
2. Labrea: “Sticky” honeypot and ids.
http://labrea.sourceforge.net/labrea-info.html
3. National vulnerability database.
https://nvd.nist.gov/
4. Openvas.
http://www.openvas.org/
5. Deraison, R.: The Nessus project.
http://www.nessus.org