Zotero is a free, open source research tool.  It automatically senses content in your web browser, allowing you to add it to your personal library with a single click.   https://www.zotero.org/

Zotero:

• collects all your research in a single, searchable interface. You can add PDFs, images, audio and video files
• snapshots of web pages
• organizes your research into collections
• creates footnotes, endnotes, in-text citations, or bibliographies
• automatically synchronizes your data across as many devices as you choose. Add to your research library on your work PC, and organize your collections on your home laptop. All of your notes, files, and bibliographic data remain seamlessly up to date
• allows you to create and join research groups to focus on any topic you choose.

Zotero Quick Start Guide

Zotero Workshop

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Citation management software not your thing?  Consider creating a research matrix.  Copy this spreadsheet or create one that is organized in a way that works for you.