• 19th Century U.S. Newspapers 
• US Newspapers Listed by State - Links to newspaper home pages
• Chronicling America: Historical American Newspapers - Library of Congress database of historic newspaper pages from 1777-1963. See a guide to this collection here.
• Liberty Magazine Historical Archive, 1924-1950 (Gale)
• Newspaper Navigator - Library of Congress collection of news photos, cartoons, headlines, and advertisements, 1900-1963
• Newswires (EBSCOhost)  - Searchable database. Near real-time access to news from Associated Press, United Press International, PR Newswire, Xinhua, CNN Wire, and Business Wire.
• New York Times - Archive. Limited number of downloads without a subscription
• Student Media Map - Provides access to over 1000 student newspapers across the US.

From this link, you can access the following collections: galesupport.com/bc/magic.php?database=BBCN&loc=bcptstothepast

• 17th and 18th Century Burney Collection newspapers 
• 19th Century British Newspapers 
• 19th Century UK Periodicals 
• Daily Mail Historical Archive, 1896-2004
• The Illustrated London News Historical Archive, 1842-2003
• The Independent Digital Archive, 1986-2012
• The Listener Historical Archive, 1929-1991 - The text of BBC broadcasts
• Sunday Times Digital Archive
• The Times Digital Archive, 1822-2008
• Times Literary Supplement Historical Archive, 1902-2009 (Gale)

• Gale NewsVault (available only within BC) - United States and United Kingdom newspaper archive collections 
• Google News - International current news aggregator
• Google Newspaper Archive (Search Tutorial)
• ​Newswires (EBSCOhost)  - Searchable database. Near real-time access to news from Associated Press, United Press International, PR Newswire, Xinhua, CNN Wire, and Business Wire.
• Online Newspaper Directory for the World - Directory to home pages of thousands of newspapers around the world.
• JSTOR Daily: Where News Meets its Scholarly Match - Provides commentary from the scholarly database JSTOR on current news.
• Wikipedia: List of online newspaper archives