Below is an Excellent Application round up by The HandHeld Blog of 20 Must have Apps for the Nokia N9:

The MeeGo Harmattan running Nokia N9 may be the last of its kind, but there seems to be no death of quality apps that are coming out for the device. It already has apps for Facebook, Twitter and a few games like Angry Birds and Need For Speed built in, but there are a few key apps which are missing.

In this post I have complied a list of must have apps for the N9, all of which are free. Most of these apps are available from the Nokia Store and clicking on the name should take you to the download page. Lets get started.
 

 

• DropN9: As the name suggests, its a Dropbox client for the Nokia N9. The app lets you download and upload filed in multiples and is a must have if you are a dropbox user.

• Internet Radio: An neat little Internet Radio app for the N9, that features a UI is similar to the default music player with album art being replaced by cover art for the featured radio stations. Discovery is helped along by ‘Hot Picks’, Locations, Language and Genre sections. Detailed post here.

• Phone Torch: No frills app that lets you use the inbuilt LED flash as a torch. Launch the app and it immediately turns on the LED and exiting the app closes it.

• Photo Enhancer: A free app from Nokia that lets you put filters on images and then share them. There are a bunch of options available like sepia, grayscale, high contrast and so on.

• Simple Mirror: There is no way to use the front camera on the N9, unless you are making a video call. But if you would like to use the device as a mirror, does the job well.

• gPodder:  A great podcast client with full integration to the gpodder.net web service and a unique user interface, supporting YouTube and Soundcloud feeds in addition to normal audio and video podcast feeds. gPodder will help you manage and synchronize your podcast subscription and listening status (including resuming, streaming and downloading). Discover new, free content via gpodder.net’s podcast directory.

• File Manager: The N9 comes without an inbuilt file manager and the this free apps fills in perfectly. Its light weight and does everything you would expect from an app of this nature.

• Battery Usage: This app mimics the battery usage graph that you may have seen on Android devices. In addition to telling you which app eats how much battery, it can also tell you how much of that battery was consumed in the background and how much was drained while the app was actually in use. This will help you decide if you can leave the app running or whether you should exit everytime you are done with it.

• City Scene: The app lets you explore a bunch of cities in the US and Europe in 3D, much like Google Street view, but with a few extra features.

 

 
Shortcuts: The N9 has a set of 4 quick access shortcuts which you can bring up by swiping up for a short distance and holding it there. The problem is that you cannot change these without an app. Enter Shortcuts which lets you change the four of these by simply dragging an app of your choice to the current location of the shortcut.
 

 
Ionic: An ebook reader for the N9 that supports the EPUB format. It supports navigation by swipe or the volume keys, display themes, brightness control, orientation locking at many more. Create bookmarks with notes, jump to bookmarks or chapters. The Library feature allows ordering books by author or title, inspecting book details, and importing books downloaded from the web.
 

 
Sports Tracker: A long favourite of Nokia users, Sports Tracker lets you track and analyze your workouts, share workout data and photos with your friends. You can also track everything online on the developer’s website.
 

 

• ScreenshotMee: It lets you take screenshots using the proximity sensor, just activate the app in the background, navigate to the screen you want to capture and cover the proximity sensor on the top right of the device. Then you can choose to save the screengrab or take a new one.

• Photo Frame: Another app published by Nokia that lets you frame pictures and then share them. There are a bunch of frames available.

• Rainbow Brush: Brilliant photo manipulation app,  it lets you quickly and easily give photos a dramatic look by converting them to black and white, while keeping your chosen details in color. This effect draws the viewer’s attention to the colored areas, creating striking images. You simply use your finger as a brush to remove or bring back the original color from regions of your image. You can zoom in or out to ensure your get the right finish. Highly recommended.

• FlickrUp: A great tool to upload a bunch of pictures to Flickr, you can create photosets, define the resolution, set privacy settings in addition to adding tags and descriptions. Has a pretty UI as well.

• Mes Input: An app that lets you add different keyboard to the N9. Like with Swype, you can swipe from the edge to switch between them. For example, I have a keyboard which gives me quick access to smileys, similarly there are a bunch of other options available. You can even create your own keyboard at www.mesinput.com and use this app to install it on the phone.

• Resource Monitor: As the name suggests, this app lets you keep track of the resources that are being used on your device. You can switch between different views that show RAM, Storage and Processes.

• Date Event: The N9′s events screen shows news, Facebook and twitter streams, but it does not show your upcoming calendar entries and that’s where this app comes in. It displays upcoming entries on the events screen and lets you choose which calendar to pull them from. You can also select the number of days it should show entries from. It is still being developed and isn’t in the Nokia Store, get it here directly .

 

 
3D World Gaze: Cool app for exploring the world around you, built with the premise that the Earth is a giant sphere and we are always on top of it. What follows is that far-away continents and cities are in reality somewhere below you and not linear, like we usually think of them. Detailed write up and video demo here.
 

Source The Handheld Blog