Unrepresented Nations and Peoples Organisation (UNPO) 
An international organisation created by nations and peoples around the world who are not represented as such in the world's principal international organisations, such as the United Nations.
http://www.unpo.org/Bank for International Settlements (BIS)
Coordinates regulations in the fields of financial services to promote international financial stability. Publications available include a compendium of documents of the Basel Committee on Banking Supervision.
http://www.bis.org/
International Organization for Migration (IOM)
Promoting humane and orderly policies in the movement of persons across borders. Supports migrant health protections, assisted returns, counter-trafficking, and technical cooperation in migration.
http://www.iom.int/
World Tourism Organization (WTO)
Global forum for tourism policy issues and a practical source of tourism know-how.
http://www.world-tourism.org/
Organization of the Petroleum Exporting Countries (OPEC)
Global organization dedicated to stability in and shared control of the petroleum markets.
http://www.opec.org/
Multi-Governmental Organizations
Extensive directory of web sites.
http://www.gksoft.com/govt/en/multi.html
World Customs Organization (WCO)
Develops standards and provides technical support for the harmonization of procedures governing the movement of people and commodities.
http://www.wcoomd.org/ie/en/en.html
G24 - Intergovernmental Group of Twenty-Four on International Monetary Affairs and Development
Concerts the position of developing countries on monetary and development finance issues.
http://www.g24.org
The Cairns Group
Trade group of 17 agricultural exporting countries, accounting for one-third of the world’s agricultural exports. Works for the reduction of tariffs, domestic subsidies and export subsidies.
http://www.cairnsgroup.org/
Energy Charter
Legally-binding multilateral instrument that strengthens the rule of law on energy issues.
http://www.encharter.org/
