Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
Classy - Expressive, flexible, and powerful stylesheets for native iOS apps
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Agilon One - Agilon One is a Nonprofit CRM software solution that connects and gathers information on constituents.
Qiqqa - Qiqqa is a free research and reference management software. It can be used in many organizational projects from the academic to the personal to the business endeavor. Read more about Qiqqa.
Little Green Light - Illuminating Data. Advancing Nonprofits.