ITIL     
http://www.itil-officialsite.com/home/home.asp

OGC   
http://www.ogc.gov.uk/

OGC Best Management Practice
http://www.best-management-practice.com/Knowledge-Centre/?trackid=002094

APM Group      
http://www.apmgroupltd.com/Home/Home.asp

EXIN               
http://www.exin-exams.com/

Benchmark Portal        
http://www.benchmarkportal.com/

ISO/IEC 20000            
http://www.isoiec20000certification.com

itSMF                          
http://www.itsmfi.org/

TSO 
http://www.tso.co.uk

Loyalist College
http://www.loyalistexams.com/

ISEB                           
http://www.iseb.org.uk