reCAPTCHA - reCAPTCHA is a free security service that protects your websites from spam and abuse.
Symantec Data Loss Prevention - Fully protect your data with the comprehensive detection technologies and unified policies of Symantec's industry leading Data Loss Prevention (DLP).
DOOM Captcha - Captchas don't have to be boring
OpenSSH - OpenSSH is a free version of the SSH connectivity tools that technical users rely on.
Humans Not Invited - CAPTCHA that filters out humans and only lets programs pass
Paubox - Paubox provides HIPAA compliant email encryption without the hassle of extra steps.