POLAR Alternatives

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

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

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.

Save the web, freely.

The simple way to save & annotate web pages and PDFs, compare different concepts across the literature, organize your bibliography and generate citations.

freemium $1.25 / Monthly (2GB Storage, 10 Projects)

Clean and simple and reference management for the web. Sync your PDFs to Google Drive and cite your papers in Google Docs.

When you find something you want to view later, put it in Pocket.

ReadCube is software that manages and organizes research papers and other documents.

Bring your life's work together in one digital workspace. Evernote is the place to collect inspirational ideas, write meaningful words, and move your important projects forward.

Ebook manager, viewer & converter

scrible lets you highlight and annotate web pages and easily save, share and collaborate on your...

BibDesk is an organizational software created to help you edit and manage your bibliography. It keeps track of your bibliographic information as well as said information's associated web links and files. Read more about BibDesk.

Diigo is a powerful research tool and a knowledge-sharing community