What would be a good theme or plugin to use to accomplish a site similar to guidestar.org?

Hi,

So I am trying to build a website similar to guidestar.org. I'm definitely not looking to monetize the website. Its sole purpose is to be a database of non-profit organizations.

I thought of using knowledge base type wordpress themes but it seems too to not really achieve the same features that is shown on guidestar.org

Any thoughts?

http://www.guidestar.org/organizations/13-1624086/metropolitan-museum-art.aspx