Report-It Hotline
Private company for hire, offers 24 hour service to schools and organizations that allow anonymous caller to leave confidential messages at a toll free number reporting vandalism or violence.
http://www.report-it.com/

Safe School Helpline
A 24-hour confidential service that empowers students, parents and community members to report unsafe, at-risk situations without identifying themselves.
http://www.schoolhelpline.com