EBSCO has free apps for E-books, Audio books and article searching. However, if you just go through a browser search, EBSCO automatically gives you a mobile view on a smart phone. Tablets usually do not default to the mobile view, but keep you on the desktop view unless you download and use the mobile app.
GALE has free apps for Apple and Android devices for searching their products.
JSTOR will also automatically recognize your mobile device and present a modified format for your screen size.
LexisNexis (for NexisUni) has apps for searching on mobile devices.
SAGE automatically redirects you to a mobile version of their journals and search pages.
ProQuest Ebook Central offers flexible options for downloading content.
Download the book to computers, tablets, and phones. Simply select your device in the first step, and the software will guide you through the rest!
Download a chapter, a page, or a range of pages in real PDF. Text is searchable and selectable, and a citation is included in a style of your choice (see the Chapter Downloads tab).