The contest, launched in partnership with the Jewish Funders Network, JTA, Natan, Slingshot Fund, Upstart Bay Area, and Jewish Jumpstart, asks clients, donors, volunteers, and board members to write reviews of these nonprofits. Visit http://greatnonprofits.org/jewish to get involved. All reviews will be automatically visible on GuideStar.org.

“Reviews show the real human impact of a nonprofits and raise the visibility and credibility of those organizations,” says GreatNonprofits CEO Perla Ni. “This will help highly-rated nonprofits attract more support and volunteers.”

GreatNonprofits is a nonprofit Web site where people can post reviews of nonprofit organizations, similar to Yelp or TripAdvisor.

Nonprofits with the most positive reviews in their category will be announced as winners and receive promotion on GuideStar.org. Awards will be given out of 10 categories (6 geographic US regions, 1 international, and 3 budget size – small, medium and large). Contest Deadline: October 31st.

In addition, everyone who writes a review is eligible to win great prizes such as signed copies of “Business Mensch,” by Noah Alper, free Noahs’ Bagels, and a stay at Kimpton hotels.