Apache Week, includes security alerts.

Security announce mailing list.

List of security announcements and information on how to sign up to security mailing list.

Subscribe to HP Security Bulletins. Requires registration.

Security alert notification service.

How to subscribe to the (free) e-mail notification service that Microsoft uses to send information about security of Microsoft products.

Security mailing list subscription.

All OpenBSD mailing lists, including security alerts.

Oracle security mailing list. Requires registration.

Notifications and advisories. Security mailing list subscription is on this page.

SGI® Security Advisory mailing list.

Includes subscription instructions for the Sun security-alert mailing list. Subscribe to this list to be alerted when security patches are released. Very low volume.

All SuSE Linux mailing lists, including security alerts.