Booth Library subscribes to electronic collections from many vendors but there are three that make up the majority of D&E's electronic sources. They are: EBSCO; JSTOR; and U.S. Government Documents.
The pdf readers outlined on the Intro tab are a solid "vendor neutral" option for reading a pdf, but if you are focusing on the resources from a specific vendor and/or want to send sources to folders you have set up on a vendor website, then you could download their app.
The EBSCO Mobile App is available via Apple or Android. When the app is downloaded select "access with your institution" and enter your college credentials (your Microsoft sign in).
There is a JSTOR app on Play Store for android devices, however "JSTOR’s interface automatically adapts to the screen size of a device without requiring a separate mobile URL or any device configuration. Just go to JSTOR via the Library's website and when viewing content on a smartphone or tablet, the screen will adjust accordingly!" (JSTOR support page)