Cost: Free
This app summarizes non-fiction books so you can understand the key points without reading the books cover to cover.

Cost: $9.99
Use your iPad as a second monitor with this app.

Cost: $9.99
Featured as an App Store Best.
MindNode makes mind mapping easy. Mind maps are a visual representation of your ideas, starting with a central thought and growing from there. This allows you to brainstorm & organize your thoughts in an intuitive way, so you can focus on the idea behind it.

Cost: Free
A simple app for creating flowcharts

Cost: Free
Mind maping tool to facilitate branstorming, idea collection and thought structuring

Cost:
$9.99
Timeline 3D for iOS 7 is a simple way to create beautiful multimedia timelines.

It's so simple & convenient - just sketch & take notes about anything in your mind.
Save and share your novel ideas in the school, cafeteria, office or even on the bed.

Cost: Free
Bamboo Paper, a notebook app designed to give you the best and most realistic inking experience on your iPad or iPad mini. Do more with your ideas - sketch or write them in an authentic paper-like digital notebook.

Cost: $4.99
Use for taking quick notes, opens to blank page, can send pretty much to anywhere, twitter, facebook, email and so forth.

Cost: Free
Dragon Dictation is an easy-to-use voice recognition application powered by Dragon® NaturallySpeaking® that allows you to easily speak and instantly see your text or email messages. In fact, it’s up to five (5) times faster than typing on the keyboard.

Editorial is a plain text editor for the iPad with powerful automation tools and a beautiful inline preview for writing Markdown.

You can combine a large selection of simple text processing actions into your very own workflows — all in an intuitive drag'n'drop interface that makes it easy to see what's happening.

Cost: Free
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.

Based off the book Getting Things Done by David Allen, Get It Done lets you focus on what's important for today and keeps everything else out of your way.

Cost $4.99
Use GoodReader with Dropbox to sync with your iPad.
An app that I see recommended by lawyers for lawyers. Does just about anything you would want with PDF files, word documents, etc.

Cost: Free
Google's spreadsheet app

Cost: Free
The easiest way to sign a document on your iPhone or iPad

From the creators of HelloFax, HelloSign is the simple and elegant way to scan, edit and sign your documents.

Need to sign a document when you are on the go? The HelloSign app saves you from the laborious process of printing, signing and scanning.. All you need to do is:

1) Import any PDF from your email or Google Drive or take a picture of the document you need to have signed.
2) Create a realistic signature with your finger. Looks just like an ink signature.
3) Via email, send the signed document to the desired recipient(s).

Cost: Free
iWrite Legal is an app designed to help legal writers improve their writing skills. The app provides writing tips and legal writing checklists to overcome writer’s block and to thoroughly revise, edit, and proofread a legal document.

Cost: Free
Text-to-speech app converts PDF files, MS Word docs into spoken words

Well rated by users, note taking app

Cost: $7.99
Note taking app., lots of useful features, well rated by users.

Cost: $10, free with iPad Air and Ipad Mini Retina
Complete word processor app integrates with iCloud so docs sync on all devices

This simple to use and intuitive application allows you to keep a track of your life, what you have been doing, how you have been feeling and further it allows you to capture your moods, contemplate your achievements and reflect on what now, what next, whatever you want….

Use it as you need to keep notes, capture pictures, load music – and it’s private so no pressure, no criticism – your place be yourself on your iPad, iPhone or iPod touch.

Take your to-do list anywhere with this feature-packed app; never forget the milk (or anything else) again. Remember The Milk (RTM) for iPhone, iPod touch and iPad connects with the popular online service of the same name. With millions of users worldwide, Remember The Milk is everywhere you are: from mobile to the web to apps including Outlook, iCal, Gmail, Google Calendar, Twitter, and more. Learn more at www.rememberthemilk.com

Free
Use this app for making to do lists, can be used with Siri.

Pulled in July 2015 by company due to a bug. Should return shortly.
Cost: $19.99
There is a non "pro" version for $3.99
SignMyPad Pro is the new standard for paperless document transfer—a simple PDF signature tool for the iPad that embeds the signer’s GPS location for extra signature security. Go green with SignMyPad Pro.

People are using Simplenote to keep notes, lists, ideas and more. Your notes automatically synchronize with your computer and all your devices. It's extremely easy to use. For those who want more power, you can also use tags, pins, versions, and sharing.

Sticky Notes is the premium note taking application that is an amazing, multi-touch enabled noteboard designed specifically for iPad.

Cost: Free version & $4.99 for version that allows you to review & edit multiple documents
See full review at Lawsites, http://www.lawsitesblog.com/2017/03/app-may-forever-change-read-legal-documents.html

Price $9.99
Air Display 3 turns your iOS screen into a wireless (or USB!) display for your Mac. Increase your productivity with extra screen real estate or mirror your Mac computer display to your iOS device. (Windows users, stay tuned. For now, you want Air Display 2.)

Cost: Free
Scan barcode to add book to Zotero, scan pages with OCR

With 10GB of free storage, Box makes it easy to store, manage and work with all your files and documents wherever you are - on the web, from your desktop and on your iPhone and iPad.

Box for iPhone and iPad helps you get work done on the go. It's fast, secure and simple to use, so you can be productive from anywhere. More than 20 million users and 200,000 companies use Box - including 97% of the Fortune 500.

Cost: Free
Write
Create, review and edit Microsoft Word® docs, Excel® spreadsheets and PowerPoint® presentations on an iPad or your iPhone.
Access
Open documents, spreadsheets and presentations from your email accounts as well as Box, Dropbox, Google Drive and SkyDrive on tablets and phones.
Share your documents
The pro feature allows you to print

Dropbox lets you bring all your photos, docs, and videos anywhere and share them easily. Access any file you save to your Dropbox from all your computers, iPhone, iPad and even the Dropbox website!

Features:
• Access all your photos, docs and videos from any device.
• 2 GB of space when you sign up -- free!
• Automatically save photos and videos to Dropbox and earn up to 3 GB additional free space.
• Share a link to even your biggest files— no more attachments!
• Add files to your "Favorites" for fast, offline viewing.

Google Drive is one safe place for all your stuff. Upload photos, videos, documents, and other files that are important to you, then access what you need wherever you go, on any device. Get going with up to 15GB of storage. Free.

Create, edit and share Microsoft Office® files (Word® documents, Excel® spreadsheets and PowerPoint® presentations) in cloud storage services like Box, Dropbox, Google Drive, SkyDrive and on your PC - all from your iPad. Enjoy productivity without boundaries in a native iPad workspace that lets you multitask with several files and storage locations open at once. Search across your personal or work Mac/PC and cloud storage for full remote access to your documents whenever you need them, in your own personal cloud.

Cost: Free, can upgrade for $4.99
Tracks when email you send is opened.

Cost: Free
A remote desktop application that allows lawyers access to their files on their desktop anywhere they can locate an Internet connection.

Cost: $6.99
Print direct to most WiFi/Wireless printers without additional software. Print to ALL printers and any document type via your Mac/PC. Print remotely over 3G/4G and in corporate/other networks where WiFi is not available. View, store & print email, large documents & PDFs, files, attachments, photos, contacts and web pages on your iPad

Cost: $9.99
Use the easy built-in panels to automatically see data about your life: calendar, tweets, e-mail, weather, news, and more. Or, use the pro panels, Graph and Table, with your own customized data sources, to see relevant data about your business or organization.

Cost: Free
Securely access your computers from your iOS device.

• On each of your computers, set up remote access using the Chrome Remote Desktop app from Chrome Web Store.
• On your iOS device, open the app and tap on any of your online computers to connect.

Cost: $9.99
App for working with PDF documents, lots of tools.

Mendeley is academic software that indexes and organizes all of your PDF documents and research papers into your own personal digital library. It gathers document details from your PDFs allowing you to effortlessly search, organize and cite. It also looks up PubMed, CrossRef, DOIs and other related document details automatically, importing papers quickly and easily from resources such as Google Scholar, ACM, IEEE and many more at the click of a button.

Cost: $9.99
Let's you mark up PDF files from your iPad and allows you to add sticky notes, freehand drawings, fill in forms, add signatures, highlight, underline and strike through as you search, read through and edit your PDF document.

Cost: $4.99
Annotate, read, manage, and share your PDFs

Cost: Free
PDF Scanner

Cost: $ 4.99
Scan multi-page documents to PDF, save or share by email, Evernote, Dropbox, Google Docs with OCR, etc.

Cost: Free
Useful calculator

Cost: $2.99
Turn your iPhone or iPad into a portable scanner

Cost: $2.99
Optimized for iPhone 5 but can but compatible with iPad

Cost: Free
Create quick, elegant presentations and slideshows, display on device, upload to web or export to PPT or PDF

Cost: $9.99
Keynote is a great App for creating presentations.

Cost: Free

SlideShark is the #1 app for viewing and sharing PowerPoint presentations on the iPad and iPhone the way they were meant to be seen – with animations, fonts, colors and graphics intact. Available for individual and corporate users, SlideShark is a business-class solution built by Brainshark, Inc., the leader in online and mobile presentations.

WebPresenter allows you to give demonstrations of your website running on your iPhone or iPad.

Combining a VNC server with the built in WebKit based browser, WebPresenter allows you to wirelessly stream your rendered website, running on the device, to your computer.