Add nonprofit organizations to this page alphabetically. Add a link to the page on the nonprofit (simply highlight the name of the organization you've added and click the hyperlink logo in the menu, then type the exact name of the page in the link box if it exists, if it doesn't exist type the name and it will create a dotted line/create page link).
Also see Nonprofit Resources.
Organizations, listed alphabetically.
(Click the link to view the page on the organization or to write the page if it it doesn't exist yet.)