- Union of International Associations
- Continually updated information on international non-profit non-governmental and intergovernmental organizations and constituencies.
- Free service with information on the programs and finances of more than 600,000 American charities and nonprofit organizations.
- International Organizations
- List of links to world and regional organizations, classified according to area of interest.
- Scholarly Societies Project
- Facilitating access to information about scholarly societies across the world.