itSMF - IT Service Management Forum
The owner and manager of the ISO/IEC 20000 certification scheme. This link enables you to derive all manner of information related to IT Service Management. Note this is a membership web site and therefore access to some pages may be restricted, requiring a username / password.

OGC - Office of Government & Commerce.
The authors of ITIL best practice, a series of books defining a framework for implementing Service Management within an organisation with which the ISO/IEC 20000 standard is aligned.

ISM - Institute of Service Management.
A new professional body set up under the auspices of the itSMF as an independently-governed body, specifically aimed at professionals in IT Service Management -to promote and support the standing of its members by establishing high-standards of professional and ethical conduct, ensuring continuing professional development of its members in order to demonstrate their competence and commitment-.

BSI - The BSI Group
The publishers of the British version of ISO/IEC 20000 (BS ISO/IEC 20000) which incorporates additional nationally relevant information in its preface and bibliography.