Zotero is free, cross-platform software that is used to collect your research in one place. Zotero not only collects citations, but also PDFs of full text articles when possible. It allows grouping of research into searchable collections while adding your own notes and tags. It can then export a bibliography in a variety of styles for your research paper!
Zotero can be also used on Android, ChromeOS, and iOS devices by using an in-browser bookmarklet. This does require a Zotero account.
Zotero - Downloads, documentation, and creating an account (a free account is not required to use Zotero, only to use Zotero cloud storage)
ZotFile - Free Zotero plugin that creates Zotero notes from PDF annotations and provides batch import/renaming operations.
Research Project Calculator - Helps set milestones for a variety of research projects based on on their due dates.
ZoteroBib - Helps you build a bibliography instantly from any computer or device, without creating an account or installing any software.
Using your personal computer:
You will see a new button on your browser's toolbar which will save the article or web site you are currently viewing to Zotero.
With Zotero 6, you can now:
For more information: https://www.zotero.org/blog/zotero-6/
If you’re already running Zotero, you can upgrade from within Zotero by going to Help → “Check for Updates…”.
Zotero offers more functionality than what is noted here, so take some time to explore! It can really enhance your research and save substantial time when due dates are looming. Take a look at Zotero's documentation for help.