Alliance for the Prudent Use of Antibiotics, APUA
http://www.healthsci.tufts.edu/apua/apua.html

Cochrane Collaboration
http://www.cochrane.de

Consumers International 
http://www.consumersinternational.org

Health Action International
http://www.haiweb.org

Healthlink Worldwide
http://www.healthlink.org.uk/

International Clinical Epidemiology Network, INCLEN
http://www.inclen.org

International Dispensary Association (IDA)
http://www.ida.nl

International Network for Rational Use of Drugs, INRUD (includes the journal INRUD News) 
http://www.msh.org/inrud

MaLAM, the Medical Lobby for Appropriate Marketing
http://www.camtech.net.au/malam

Management Sciences for Health
http://www.msh.org

The International Drug Price Indicator Guide is available on Management Sciences for Health Manager's Electronic Resource Centre
http://erc.msh.org

Médecins Sans Frontières
http://www.msf.org

MSF's access to medicines campaign
http://www.accessmed-msf.org

Public Citizen Health Research Group
http://www.citizen.org/hrg

Wemos Foundation, Dutch NGO concerned with international health issues, including a campaign to improve drug donations
http://www.wemos.nl