- Idealist.org: Action Without Borders
 - Includes a directory of thousands of nonprofit web sites, an online library for nonprofits, and a database of volunteer opportunities nationwide. - TechSoup
- Aggregates computer and technology news, information, technical assistance, and more for the convenience of nonprofit organisations.
- American Philanthropy Review
- Online discussion forums on nonprofit management and development issues, career search and registry service.
- USA.gov for Nonprofits
- Official information and services for nonprofits from the U.S. government, including agency-specific resources, fundraising, grants and loans, regulations, and tax information.
- TechFoundation
- Provides nonprofits with access to technology, expertise, and capital.
- Excess Access
- Offers services linking business and household item donations with nonprofit wishlists.
- NonprofitOyster, Inc.
- Offers nonprofit sector-related employers and jobseekers a place to find each other.
- Nonprofit Good Practice Guide
- Resource for nonprofit organisations and foundations to use in staff training.
- Direct Action and Research Training (DART) Center
- Represents local, grassroots, congregation-based, community organisations committed to building power for racial, social, and economic justice.
- Craigslist Foundation
- Brings visibility to small, grassroots nonprofits involved in local social change work, through web sites, community events, and special projects connecting nonprofits and new supporters.
- GreenInfo Network
- Helps non-profits and public service organisations take advantage of the power of geographic information systems.
- Inkindex
- Facilitates donation of excess inventory to nonprofit organisations.
- IRS: Charities & Other Non-Profits
- Tax information, resources, news, forms, and instructions for charities and other nonprofit organisations.
- Center for Prevention Research and Development
- Dedicated to the application of research to public service, aiming to improve the lives of children and families, especially those in disadvantaged environments, by serving as a resource for local communities, state and national agencies, and foundations.
- Pacific Institute of Resource Management
- Provides a holistic view of the state of our world, how it got this way, and what we must do to make a better world for ourselves and future generations.
- Dotville United
- Nonprofit offering low-cost transportation and barter services for charities, as well as consulting to social enterprises focused on eliminating root causes of hunger and poverty.
- Plymouth Institute
- Seeks to bring unbiased interdisciplinary perspectives and analytical methods to bear on complex challenges and publish findings in the public interest.
- Causecast
- Offers a platform where media, philanthropy, social networking, entertainment, and education converge to serve a greater purpose.
- Convio
- Convio offers products and services to assist nonprofit organisations of every sector and size. Software options include CRM and CMS solutions.
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