Society/People/Lost_or_Missing is for sites providing general information and assistance to friends and families of lost or missing persons. It includes databases of missing persons, lost friends and relatives as well as links to cross-reference directories and other potential sources of information and services for tracing missing persons.
Aims to reunite ex-residents from within local communities within the UK. Registers, chatroom and links. Requires registration. http://www.exresidents.co.uk/
A missing persons site featuring long-term disappearances from Europe, Australia/Oceania, Latin America, Asia and Africa. Sorted by country. http://wherearethey.bravepages.com/
International volunteer organiziaton dedicated to missing persons and unidentified victims' cold cases. Includes search database, unexplained disappearances, and unidentified victims. http://www.doenetwork.us/
UK based charity specialising in international parental child abduction. Includes online advice, prevention guides and information on support services. http://www.reunite.org/
Free people finder that can even help you find someone you've met in a nightclub or bar without knowing his or her name. http://thefreepeoplefinder.com/