This article will focus on miscellaneous office productivity apps you can use on your iPad. Specific pages also exist for these productivity apps:
OmniFocus: A great app to manage your projects and tasks. It syncs to the Mac version, but it works very well on its own, in some ways it is better than the Mac version. OmniFocus supports GTD concepts such as: Inbox, Projects, Tasks, Contexts (including GPS-location based), On Hold, Review Cycle, etc. It has a great interface.
OmniGraffle: This is a great drawing app on the Mac (like Visio, for you Windows-folk). I don't so much create new documents on the iPad with OmniGraffle, even though you can. But I use it for viewing the documents I have cerated on the Mac. I have network schematics, building floor plans, lab floor plans, etc.
OmniOutliner
It's finally out! Anybody who has used OmniOutliner on the Mac, knows it is a powerful and flexible outlining application. It has a great interface for moving items around, and has flexible styles and columns. Watch the video here.
2Screens: 2Screens is a great app for presenting. Not only can it read PowerPoint and Keynote files, but you can present any document on a projector. It has a built in web browser with bookmarks as well. While you are presenting your content (whether it is a PowerPoint, or a webpage, or any document) you can write on top of it, like an interactive whiteboard. You can also use it with a "blank" screen as an interactive whiteboard. It has a built in laser pointer. It allows for viewing of presenter notes.
iThoughtsHD: iThoughts HD is a mind-mapping tool. I tried several apps, and I found this to be the easiest to use and most versatile. It can import and export a variety of mind-mapping file formats.
FileMaker Go: This one is pretty neat. Put a FileMaker database on your iPad. It works without any modification! Search records, modify records, add new records, run scripts! The drawbacks are that you cannot sync your data back to the original database or act as a client to networked database. Also, you cannot create new databases or design/change the structure of existing databases. But it gives you a great tool to have access to your data on the go.
1Password: Syncs to the Mac version. Holds your online usernames and passwords, credit card information, provatenotes, etc. makes it easier to login to secure websites.
Dragon Dictation: You speak, it types
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