I'm a huge fan of Lumity.
Lumity is a Chicago-based nonprofit organization dedicated to helping other nonprofits to improve their operational capabilities. Core offerings include nonprofit technology consulting, nonprofit finance help, and nonprofit accounting support services. In addition, Lumity oversees a number of special initiatives that help nonprofits to make the connections that they need to be successful. This includes NPO.net, one of the largest nonprofit job boards in the country; CTC Connect, an initiative that helps local community technology centers (CTCs) to be more productive and more sustainable; and the Community Corps - Chicago portal, a volunteer matching site connects talented volunteers to nonprofits that need support. Focus is principally on helping Illinois nonprofits but they have some programs that extend to other states.
Lumity's results and impact always impress me. The nonprofits they help "do good" better, and there are countless success stories at the individual level too. The leadership team, the staff, and the board are all top notch. Great people and a great cause!
Review from Guidestar