Zotero is compatible with Windows and Mac, and integrates easily with Chrome, Firefox, and Safari. (At present it is not compatible with Internet Explorer/Microsoft Edge.) Download metadata to your desktop library, which you can set up to sync automatically with your web account. Export citations to Microsoft Word, LibreOffice, and Google Docs.
Download Mendeley on multiple devices and sync your citations across the devices using your online Mendeley account.
EndNote Basic, also known as EndNote Web, is a free web-based application offered by Clarivate Analytics and Web of Science. EndNote Basic is a stripped down version of the EndNote product that is available for purchase.
Proper citation is a crucial part of academic writing, and citation management software will help you both cite and organize your research. While there are many options, including the good old-fashioned manual, the ones listed here are among the most popular and reliable.