"EBSCOhost provides seamless access to the EBSCOhost (ehost) or EBSCO Discovery Service (EDS) interfaces via mobile devices without the need to download an application."
"JSTOR’s interface automatically adapts to the screen size of a device without requiring a separate mobile URL or any device configuration. Just go directly to www.jstor.org on a smartphone or tablet, and the screen will adjust accordingly!"
"Science.gov searches over 55 databases and over 2100 selected websites from 13 federal agencies, offering 200 million pages of authoritative U.S. government science information including research and development results. Science.gov is governed by the interagency Science.gov Alliance."
EndNote Online also has a mobile version of its bibliographic resource. While this does not have the full functionality of the online site, you can log in with your EndNote username and password and access your EndNote account.