Zotero is a great free reference manager that collects all your references in a single, searchable application (your library). You can add PDFs, images, websites, and really anything else. It can attach pdf files to the parent record for an item, and saves all the links and information you need.
- Keep track of references, links, and pdfs as you research a topic
- Insert references and bibliographies into your research papers in seconds
Start here - Zotero Essentials - for the basics.
- Zotero can be downloaded (free) from https://www.zotero.org.
- Zotero is free, but charges for storage exceeding 300MB. However, you can choose to back up just your citations to the cloud, which means you will never hit the storage limit.