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

Monkkee - Keep a private journal securely on the Internet – to provide a convenient user experience your...

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

Scrapbox - A new style of note-taking that lets you create, discuss, and learn together in one self-organizing space.

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.

Idea Notebook - Idea Notebook is an app that allows you to keep track of your logs business ideas and track as well as organize them.