GreatNonprofits
GreatNonprofits is a 501(c)(3) registered non-profit organization based in the United States with a website where donors, volunteers, and clients review and share their experiences of charitable organizations, essentially providing crowdsourced information about the reputability of these organizations. It was founded in 2007 by Perla Ni and has an operating budget of an estimated $750,000.
GreatNonprofits grants "Top-Rated" ranking to organizations that have maintained an average rating of 4.5 stars throughout the year. The group's website has ratings on around 6,500 nonprofits.