PubChase - Read More, Search Less. Stay up to date with biomedical research relevant to you!

DEVONthink - DEVONtechnologies develops DEVONthink, DEVONagent, and other Mac and iOS apps for document and information management and web research.

Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.

Keep It - Write notes, keep things, and find them again

Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.

Google Docs - Create a new document and edit with others at the same time -- from your computer, phone or tablet. Get stuff done with or without an internet connection. Use Docs to edit Word files. Free from Google.