Denmark:
Danish Ministry of Science, Technology and Innovation (VTU),
Danish IT and Telecom Agency (ITST)

Norway:
Norwegian Ministry of Government Administration and Reform eProcurement Secretariat http://www.ehandel.no
e2b Forum (an e-invoicing initiative in the private sector supported by the government) http://www.e2b.no

Sweden:
Single Face To Industry (SFTI), the public sector initiative in Sweden to promote e-business by the Swedish National Financial Management Authority (ESV), Swedish Association of Local Authorities and Regions (Sveriges Kommuner och Landsting), and Swedish Administrative Development Agency (Verva)

UK:
OGC buying solutions under Office of Government Commerce

Finland:
State Treasury
Tieke Finnish Information Society Development Centre

Island Icelandic information site on UBL - NES:
FJS, Icelandic State Accounting office
IcePro, The Iceland Committtee on e-business and Trade Procedures (private sector initiative supported by the government)