Zotero is the best solution for storing sources and files, building shared libraries, and reusing sources. But if you're looking for an easy way to create a single bibliography or format citations instantly, without creating an account or installing software, ZoteroBib is an excellent option.
You can add and edit entries in ZoteroBib to create formatted bibliographies and generate parenthetical citations or footnote/endnote text to paste into documents. While Zotero offers persistent storage (with options for networked and local storage of your bibliographic data), ZoteroBib primarily stores entries in your browser.
For more information about ZoteroBib, check out their Frequently Asked Questions.
