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CiteULike

Search, organize, and share scholarly papers.

citeulike.org - Scholarly Papers

Delicious

One of the first social bookmarking sites.

del.icio.us

Diigo

Highlight, annotate, and share web pages with this unique knowledge-sharing tool.

diigo.com

Evernote

Index and search text, images, and media clipped from local documents and the Web.

evernote.com

Reddit

Social bookmarking site with numerous subtopics.

reddit.com

Stumble Upon

Web site bookmarking and social discovery service.

stumbleupon.com

Zotero

Firefox extension for collecting, managing, and citing resources.

zotero.org