2011
Comment spam protection and CAPTCHA service | Mollom
by 7 othersMollom is a web service that helps identify content quality and stop spam on blogs, social networks or community websites.
Using a Hosts File To Make The Internet Not Suck (as much) (0.0.0.0 version)
A hosts file to prevent your computer from connecting to selected internet hosts. This is an easy and effective way to protect you from many types of spyware, reduces bandwidth use, blocks certain pop-up traps, prevents user tracking by way of "web bugs" embedded in spam, provides partial protection to IE from certain web-based exploits and blocks most advertising you would otherwise be subjected to on the internet.
2010
Bouncer - znarf's Bouncer at master - GitHub
Bouncer is a real time statistics and security engine written in PHP5. It analyses the browser or bot version, and detects eventual bad behaviors in order to prevent spam.
2008
Defensio ยท Outsmarting Evil Spam
by 3 othersAn API aimed at qualifying blog comment spam. Accpeted input/outputs are XML and YAML.
2007
DomainKeys Identified Mail (DKIM) Signatures
DomainKeys Identified Mail (DKIM) defines a mechanism by which email messages can be cryptographically signed, permitting a signing domain to claim responsibility for the introduction of a message into the mail stream.
1
(5 marks)