Zotero

Data syncing merges library items, notes, links, tags, etc.—everything except attachment files—between your local computer and the Zotero servers, allowing you to work with your data from any computer with Zotero installed. It also allows you to view your library online on zotero.org. Data syncing is free, has no storage limit, and can be used without file syncing.

Steps to syncing your Zotero library:

• Register for a Zotero account.
• In Zotero, go to Edit and then Preferences. Open Zotero's Sync preferences tab and enter your login information in the Zotero Sync Server section. By default, Zotero will sync your data with the server whenever changes are made. To disable automatic syncing, uncheck the “Sync automatically” checkbox in this section.

In addition to automatic syncing, you can sync manually at any time by clicking the “Sync with Zotero Server” button on the right-hand side of the Zotero toolbar. By default, Zotero will merge your local Zotero library with your library on zotero.org—any changes you make in one place will be applied to the other and on all other synced computers.