Zotero: Reference management and Knowledge organization

 Zotero is an intuitive and well-developed desktop software application for digital reference management and knowledge organization, designed for web browser-based research (e.g., Firefox, Chrome, Safari, or Microsoft Edge) as well as collaboration and community engagement. The software is free and was developed by a U.S. university as a nonprofit, open-access tool.
  
Zotero is primarily designed for individual knowledge work, but it also offers the ability to collaboratively use and edit content in groups. Zotero can be used on various operating systems (Microsoft Windows/macOS, Linux) and features interfaces to word processing systems, mobile apps for Apple and Android, and a wide range of useful extensions with specialized functionalities.
 
With Zotero, data (e.g., bibliographic information) and files of all kinds (PDFs, Office documents, images, videos, etc.) can be collected, managed, analyzed, organized in a variety of ways, and linked together. Using the note-taking feature, users can create analyses, ideas, comments, and more—either in connection with specific items or independently of them. In the so-called “collections” within your personal Zotero library, materials can be grouped by topic to structure projects of any kind in detail. Citations and bibliographies can be automatically generated in word processing programs such as Microsoft Word, Google Docs, LibreOffice, or Overleaf. Since version 6, Zotero has included an annotation editor for PDF documents. This allows users to analyze PDF documents and integrate and reference text passages (e.g., quotes) directly into word processing documents with a single mouse click.