Anti-Spam SMTP Proxy Server implements multiple spam filters
Anti Spam SMTP Gateway
CIDRAM: Classless Inter-Domain Routing Access Manager.
Google Apps Script to send third party recruiter email to spam
Open-Source Phishing Framework
Remote anti spam utility
Anti Spam AddIn / Plugin for Outlook
Unsubscirbes from newsletters, mailing lists and so on.
An easy-to-use anti-spam email gateway
An InApp and Browser Adblocker based on hosts file blacklists
Perhaps the smallest system-wide Adblocker ever!
Block or allow connections by country address blocks
Open Source Anti-Spam and Anti-Virus Gateway
Virtual Appliance of RadicalSpam
Realtime Anti-Phishing Training Online Resource
A simple PHP-AJAX captcha application
A program that detects and blocks phishing, pharming, Hacker's C&C.
'SMS and Call Filter' can filter sms based on trained data set.
A static source code analyser for vulnerabilities in PHP.