Harlequin CRM for Charities
Harlequin designs CRM, fundraising and accounting software that enables charities to stand out and achieve strategic success. Established in 1986, Harlequin supports over 300 not-for-profit organizations across the UK. Harlequin works with healthcare and welfare organizations, faith charities, education establishments, museums, and membership associations. Harlequin’s award-winning credentials see us regularly rated highly in the Charity CRM Software Survey and being voted Best Database Supplier in the Institute of Fundraising’s Partners in Fundraising Awards. For the eleventh year, Harlequin has scored highly across the board in the charity CRM Software Survey. Harlequin develops integrated charity management solutions that encompass CRM, fundraising, finance, membership and service delivery. We work with over 300 organisations in the not-for-profit community, from a broad range of sectors.
Learn more
Charity Navigator
Charity Navigator is a free, web-based research platform that helps millions of donors discover and support nonprofits by providing unbiased, data-driven ratings on over 225,000 organizations. Its rigorous methodology evaluates each charity’s financial health, accountability, and transparency, measuring stability, efficiency, program cost-effectiveness, and sustainability, to show not just where dollars go but what they achieve. Donors can explore curated lists by cause, set up real-time alerts for rating changes, and use interactive tools like the Giving Basket to fund multiple charities in a single checkout while controlling how much information is shared. Aggregating data from IRS filings, partner organizations, and charity submissions, the platform powers comprehensive dashboards and educational guides on effective giving, enabling side-by-side comparisons, personalized recommendations, and in-depth insights without charge.
Learn more
CharityAPI.org
CharityAPI.org is a simple API for data about US nonprofits and charities sourced directly from IRS filings. It enables developers to retrieve nonprofit records by EIN or Tax ID number, returning the exact information the IRS has on file; perform fast, full-database searches across approximately 1.7 million nonprofit entries; and verify whether a nonprofit qualifies as a public charity with tax-deductible status. The service’s data ingestion pipeline handles all IRS data cleaning, exception management, and JSON conversion, so you can integrate accurate, up-to-date charity information in minutes. CharityAPI.org provides a free tier for registered charities that validate their Tax ID, encouraging companies to offer no-cost services to nonprofit partners, and offers clear, RESTful endpoints and comprehensive documentation to support building donation apps, status-verification workflows, and fundraising platforms efficiently.
Learn more
Go REST
Go REST is a GraphQL and RESTful API platform for testing and prototyping that delivers fake data with real responses, available 24/7 via public endpoints for users, posts, comments, and todos. It supports multiple API versions with full search on all fields, pagination (page and per_page), rate-limiting headers, and response format negotiation. Standard HTTP verbs are supported, and mutating requests require an access token via HTTP Bearer or query parameter. Nested resources let you retrieve related data, user posts, post comments, and user todos, while request and response logging, customizable rate limit,s and daily data resets ensure a clean testing environment. A GraphQL endpoint at /public/v2/graphql offers schema-driven queries and mutations.
Learn more
