Below is a list of resources for artists and arts organizations:

Americans for the Arts (AFTA)
Service organization for arts education, community-based arts, and arts advocacy

Association of Performing Arts Presenters (APAP)
Service organization for performing arts presenters

Board Source
Building effective nonprofit boards

College Art Association
Service organization for those committed to practicing, teaching and researching visual arts and humanities; a great source for connecting residencies with arts faculty

Dance USA
Addresses needs, concerns and interests of the professional dance community

The Foundation Center
Resource for philanthropists and grant-seekers

Fractured Atlas
National association providing services and support to artists and arts organizations

Fund for Folk Culture
Provides support for folk and traditional arts 

Grantmakers in the Arts
Discourse on ideas about arts philanthropy within a diverse community of grantmakers

GuideStar
Financial data on more than 1.5 million nonprofits, including yours!

National Alliance for Media Arts & Culture (NAMAC)
Service organization for the field of media arts

The National Arts and Disability Center (NADC)
Resource for the field of arts and disability

National Performance Network
Provides support for established and emerging performance artists

Network for Good
Tools for nonprofits for online fundraising, effective websites, and more amazing resources, including Fundraising123

New York Foundation for the Arts (NYFA)
Resources for NY artists, with an online database of residency opportunities, publications, and more

Public Knowledge
Public-interest advocacy organization dedicated to fortifying and defending a vibrant information commons

Theatre Communications Group
Service organization for non-profit professional theatre

The Urban Institute
Nonpartisan economic and social policy research organization

VSA Arts
International organization creating learning opportunities through the arts for people with disabilities