Looking for the goods on nonprofit organizations? GuideStar is a directory with information on the programs and finances of more than 1.8 million IRS-recognized nonprofits. The directory is free, and if you register (still free) you are entitled to more data. The databases helps users decide which organizations to donate to, which nonprofits to provide grant funding to, and who to volunteer with, plus it helps non-profits learn how to increase funding. Researchers can evaluate charities' performance overtime and compare multiple organizations at the same time.
With your free registration you gain access to the nonprofit tax forms - Form 990s. With the 990s you can see how an organization is funding and how they are spending those dollars: