In addition to all the definitions from Merriam-Webster's Collegiate Dictionary, this app offers voice search – to let you look up a word without having to spell it – along with synonyms, antonyms, example sentences, Word of the Day, and more. Available for both iOS and Android.

Encyclopaedia Britannica, the world's most trusted reference tool, provides this handy mobile site. There is also an app designed for iPhone and iPad you can download from iTunes.

Northwestern University and LinkedIn Learning (formerly know as Lynda.com) have partnered to offer University students, faculty and staff unlimited, on-demand access to a full library of online courses at no additional cost. Course topics include most major software programs as well as workplace skills like presentations, leadership and career development. Log in using the link above.

There are a number of Oxford Dictionaries and Thesauruses available as apps for mobile and other devices, created by trusted partners.

STAT!Ref Mobile Access takes STAT!Ref healthcare e-sources on the go. With powerful interactive functionality, STAT!Ref Mobile Access allows users to search Northwestern’s subscriptions anytime, anywhere. Follow the instructions on this site to activate your account. Available for iPhone, iPad and Android.

Presented by the Library of Congress, this mobile version of the "Constitution of the United States of America: Analysis and Interpretation" is a comprehensive analytical legal treatise prepared by attorneys of the Congressional Research Service at the direction of the United States Senate. Available only for iPhone and iPad,

Mobile-optimized site of the popular open encyclopedia. Apps are also available for both iPhone and Android.

Wolfram Alpha is a knowledge base that is especially powerful in working with algebra, symbolic and numerical computation, visualization, and statistics. It is available for iOS, iPad and Android.