" EDIT Documents to Go lets you :. CREATE & VIEW Word, Excel & PowerPoint files (Office 2007/2008/2010)• VIEW/EDIT/SYNC your cloud files! Support includes Google Docs, Dropbox, Box.net, iDisk & SugarSync• VIEW PDF, iWork, Text, .RTF files, and more!..."
" It can catch documents from any source you can imagine: PC or Mac computers, web sites, email attachments, iDisk, Dropbox and other online file storages and even iPhones. All files are saved to your iPhone or iPod Touch locally so you can enjoy reading them anywhere!...."
" Dropbox is a free service that lets you bring all your photos, docs, and videos anywhere. Any file you save to your Dropbox is accessible from all your computers, iPhone, iPad and even the Dropbox website...."
4- Wolfram alpha
"Across thousands of domains--with more continually added--Wolfram|Alpha uses its vast collection of algorithms and data to compute answers and generate reports for you..... "
5- Good Reader
" GoodReader has earned its accolades by the way it handles huge PDF and TXT files, manuals, large books, magazines, and renderings of 100 mb and more with great speed. The ability to mark-up PDFs opens up new doors to GoodReader users who can now use typewriter text boxes, sticky notes, lines, arrows, and freehand drawings on top of a PDF file....."
6- iSource APA
"Writing a bibliography can be hard. Keeping track of your resources, quotes and how to format them can be downright daunting. iSource does quick work of formatting bibliography and in-text citations for you, saves these formatted entries all in one place and could not be easier to use..... "
7- Cloud Readers
" CloudReaders (TM) is a free book/comic viewer, fully optimized for iPad (and now supports iPhone/iPod touch too!). It supports PDF, CBZ, ZIP, CBR and RAR format, and p2p file faster between iPads/iPhones via Bluetooth. ...."8- iBooks
"iBooks is an amazing way to download and read books. iBooks includes the iBookstore, where you can download the latest bestselling books or your favorite classics – day or night. Browse your library on a beautiful bookshelf, tap a book to open it, flip through pages with a swipe or a tap, and bookmark or add notes to your favorite passages.... "
" View and present your prezis anywhere with simple, intuitive multitouch gestures. Drag to pan and pinch to zoom in or out of topics, just like you do in any map apps. Revise and retouch your prezis, correct typos and adjust your presentation on-the-fly.... "10- Instapaper
" Save web pages for later offline reading, optimized for readability on your iPhone or iPod touch's screen. Featured by Apple and critically acclaimed by top blogs, newspapers, and magazines...."11- Evernote
" Evernote is an easy-to-use, free app that helps you remember everything across all of the devices you use. Stay organized, save your ideas and improve productivity. Evernote lets you take notes, capture photos, create to-do lists, record voice reminders--and makes these notes completely searchable, whether you are at home, at work, or on the go. ... "