DOOM Captcha - Captchas don't have to be boring
Microsoft BitLocker - BitLocker is a full disk encryption feature included with Windows Vista and later.
reCAPTCHA - reCAPTCHA is a free security service that protects your websites from spam and abuse.
Paubox - Paubox provides HIPAA compliant email encryption without the hassle of extra steps.
Squat Captcha - The worst captcha ever! Forces you to do 10 squats
OpenSSH - OpenSSH is a free version of the SSH connectivity tools that technical users rely on.