Anti-Spam SMTP Proxy Server implements multiple spam filters
Google Apps Script to send third party recruiter email to spam
An easy-to-use anti-spam email gateway
Hostsfile updater that pulls an updated hostfile from an online source
Perhaps the smallest system-wide Adblocker ever!
A program that detects and blocks phishing, pharming, Hacker's C&C.
'SMS and Call Filter' can filter sms based on trained data set.