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Learning Japanese, or wish to start? Maemo port of a libre desktop program Kanatest can help you learn both katakana and hiragana characters.

Kanatest will test your knowledge by showing you kana characters and having you type in their romaji equivalents. At the end, your statistics will be shown, and later you can compare your older results with your new ones.
What makes it a really-really good piece of learning software are tons of helpful functions and features, like translations of the program to other languages, definable lessons together with many predefined ones, a complete character chart, test on either kata, hira or both, the aforementioned statistics, which can be shown in a nice graph or table, minor things, like font customization.

Kanatest can be fetched from Extras, there are no differences with the Devel or Testing versions, find it under Education section in a graphical package manager or simply run:
sudo gainroot
apt-get install kanatest
So, if you’re into learning Japanese, go check the app out. It will be worth it.

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Doing some math that requires you to calculate derivatives? Rather than calculating them yourself, you might want to let a calculator do it for you. Derivative is rather good one.

Derivatives runs on SymPy, which is a powerful symbolic math library and allows Derivative have a couple of interesting features. Mainly, Derivative can count all types (ordinary, partial and multiple) of derivatives from 1 to 3 variables, calculates gradient, divergent, curl and laplacian, has support for many output formats (from simple and bidimensional to even LaTeX, C and Fortran), simplification methods for non-numerical calculations, support for variable names like alpha, lambda etc. and much more. Of course, it’s completely free software. Just fetch the app from Extras with
sudo gainroot
apt-get install derivative
and check all the features for yourself.

Have questions or suggestions? Maybe a problem? Drop us a comment or leave a post on our forum and we’ll look into it.

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Concerned about the health of your N900? Healthcheck can help you out not only to check your phone for hardware failures, but also to view your system information easily.

Get it off extras with
sudo gainroot
apt-get install healthcheck
Healthcheck will allow you to view various bits of info, as you can see on the screenshot above, from your IMEI to hardware status. As the app name suggests, this will help you determine whether there’s something wrong with your N900.
You can also check your total memory status in a nice table, GSM information, CPU frequencies, other things, but the best part of it all are various tests you can run to check for hardware issues. Such as the pointer test, to check whether there’s anything wrong with your display.

Having all that functionality, healthcheck is a really good app to keep your phone in a good condition.

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Find your mobile carrier’s SMS rates a bit too high? Well, there’s a solution: you can send SMS via internet easily using Web2SMS!

Web2SMS is available in the Extras repository, so just run
sudo gainroot
apt-get install web2sms
to install it.
Once launched, you can set yourself up an account. Web2SMS supports many providers, so pick one that suits you from the list. You will need to register on the provider’s website. Of course, the rates for SMS sending vary from provider to provider.
Then, just tap the created account name and send a message to anyone. Selecting a contact from your contact list works too. The time it takes to send a message depends on your provider, some may take longer than others.

So, if you don’t like the rates your mobile carrier sets, or if you just want to save up some money, use Web2SMS. Most of the time it will be cheaper than sending them like you would normally.

Please note: some mobile carriers in certain countries may not like you using such methods of sending. Please read their terms of service to see, whether they allow it or not.

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Everybody occasionally needs to make a sketch or write something. But oftentimes, there just might not be a piece of paper or anything to write with lying around. On such occasions, you might want a handy sketching tool around.
The N900 sure comes with a stock “Sketch” app, but you sure might notice it might be pretty slow and unresponsive. But hey, there’s a better one available! Try PenPen.

There’s a variety of reasons, why PenPen is a good sketching app. First of all, it’s fast and responsive, whatever you will be writing will appear on your virtual paper almost instantly. Next, it has some very good support for portrait mode. Finally, there’s multiple page support, which means you can easily separate different drawings.

PenPen is currently available at the Extras repository, so just get it with
sudo gainroot
apt-get install penpen
If your job or hobbies include a lot of sketching, like mine do, then PenPen is a good thing to have on your N900. If you’re in a worry of your screen getting damaged, or just want to get a better experience from your mobile sketching, you might also want to grab a good screen protector from our store.
 
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Have a suggestion? A problem? Post them on our forum or in the comments and we’ll look into it.

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With all the latest hype about QR-codes, you must certainly would want a QR scanner on your phone. Especially if you’re living in Japan, where QR-codes are most popular.
Well, the N900 sure has a QR-scanner, and a pretty good one! mBarCode, together with a QR plugin can read both barcode and QR information.

You can get both mBarCode and the QR-plugin from the Extras repo:
sudo gainroot
apt-get install mbarcode mbarcode-plugin-qrcode
Launch the application and now you have a very good scanner! Target your camera at a QR or a barcode and the information gets read almost instantly. Links and other “can-be-malicious” content is shown to you before getting opened with your tap. You can even check the shortlinks by copying them and visiting this site.
You can also store the scanned code into a file, or read the code from a file you stored. That way you can use the codes later, or scan the codes downloaded from a website.

With all that, mBarCode is a must-have if you’re used to dealing with QR and barcodes.
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In case if you’d want to test how it works and you don’t have any scannable codes around, you can use an online generator, like this one.

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If you happen to run a GNU/Linux machine and often play video games, then you might have heard of Teeworlds. If you didn’t hear about it yet, Teeworld is a retro-styled 2-D online side-scroller, which has pretty graphics, fast-paced gameplay with the well-known game mods: CTF, Deathmatch, etc. A lot of user-created content is available for the game, including extra modes, maps, and graphical sets.  Well, thanks to the Maemo being a complete GNU/Linux distribution, Teeworlds is surely available for playing on your N900!

The package for Teeworlds is available in Extras and you can install it with
sudo gainroot
apt-get install teeworlds
Once installed, you can launch it and see how actually well does the PC game run on your phone. Teeworlds starts up pretty smoothly, can access all the servers, settings and everything else. While you might think that the N900 keyboard might not be suitable for playing, the default key bindings prove otherwise, the game is played fairly well. If you don’t like the bindings, of course you can set your own.
Another point for Maemo’s power as a mobile platform, such a game is definitely worth trying, so check it out!

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Note: the steps we go through this how-to include modifying low-level system files and imply that the readers know what they are doing. If you can’t understand some bits or think you might break something, you might want not to try this hack.
Interested in further customization of your N900? Then let’s take a look at how to change that “Swipe to unlock” screen that appears when you press the powerkey with screen locked.
The files we’re interested in are located under two directories:
 /usr/share/themes/alpha/backgrounds/
and
/usr/share/themes/alpha/images/
Now, the files are lockslider.png, which is a background image located in the first directory mentioned; LockSliderTop/Bottom/Left/Right.png, which are the backgounds for the slider itself and are located in the second directory mentioned; and, finally, LockSliderThumb.png and LockSliderPortrait.png, which are the images for the slider button in landscape and portrait mode. These are also in the second directory mentioned.
You know the file names now, so you’d want to get creative and make substitutes for those originals! Back them up, if you need it.
Use the original files as a base, you need to be sure the image sizes match. That is, lockslider.png needs to be 800×480, other files need to be the same size as their originals. Check out this custom set for further example.
As soon as you finished creating your files, drop them all to their respective directories and reboot your phone.
  cp -f lockslider.png  /usr/share/themes/alpha/backgrounds/
cp -f LockSlider*.png /usr/share/themes/alpha/images/
sudo gainroot
reboot
Enjoy your new custom Swipe-to-unlock screen!

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Need to take a couple of notes? Simple calendar notes and/or text files not enough for you? Then check out Conboy, a clone of Tomboy, which is a very good note management program!

As soon as you get the package (which is available in the Extras repository) and run the app, powerful note managing capabilities will unfold on your screen. Conboy allows text formatting, text alignment, zoom and quite some extra stuff, all of which you can check by looking around the menus and the interface. And it’s all quite readable and manageable!

By pressing that little folder icon, you’ll get a list of all your notes, which can all be searched, sorted, deleted, edited… All management operations are handled quite well, which makes Conboy even better.
So, if you keep forgetting things, or if you’re used to taking a lot of notes, like I am, then Conboy is surely a must have on your Nokia N900.

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No doubt, your phone must be something very valuable for most of you. If so, you will want to keep it away from thieves. HandsOff is a handy app that will help you with that.

HandsOff is a simple alarm tool that will detect possible theft of your N900, using light and proximity sensors. Just type in a PIN-code and, well, press the big red button on top.
After armed, as soon as your N900 leaves the area where it’s supposed to be, a loud alarm will notify you about it right away, and might prevent a theft. Surely, the alarm won’t stop, unless a proper PIN-code is entered. You can also set your own alarm sound and sensitivity, so you can carry the phone in your pocket. You might want to tweak the settings a bit, until your desired settings are discovered.
Even something that relatively small can prevent a theft, so if you’re paranoid, or just want to keep your N900 safe, you should probably try HandsOff.

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Ever played Crayon Physics Deluxe? Well, I’m sure you’ll be happy to learn about it’s FOSS clone, Numpty Physics! And what’s more, it runs on your Maemo device perfectly!

In case if you never heard of the game, here’s a quick overview: you have a ball/box/something ‘A’ and you must get it to star/box/something ‘B’. How you do it is completely up to you, your stylus and your imagination. With such a simple premise, the game is very-very fun and has a huge replayablility factor, as every level can be passed with at least 10 ways.
Need to get a ball over a palm tree? Build a giant mallet to hit it! Or create a zipline than will take the ball over the tree. The possibilities are basically endless. In case if you get bored with 17 alread included levels, you can download more, or easily create your own levels!

A little and simple, but very addictive game that will make sure to hold your interest for long and kill the time whenever you want. So get the game and start creaating!

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Are you in a liking of chess games? Playing with the AI doesn’t seem as good as playing with real players for you? Then you should totally check out Miniature, an FICS client for Maemo!

Miniature is currently only available at Extras-devel, which means you would want it enabled in your repo list. Don’t worry, that doesn’t mean the game is not good enough for everyday use, I myself have tested many releases and they work perfectly. In case if you need help enabling it, check out this wiki article. Make sure to disable it right after downloading the package though.
Now, Miniature enables you to play games hosted at FICS with thousands of players all across the world and even allows you to play P2P games with people nearby or with people in your contacts list. Registering at FICS is not required, but is recommended, if you want to keep easy track of your own games and stats. Host a game or join one of those already available and you’re ready to dive into a nice game of chess with anyone. And you even have easy to use text chat!

Miniature also holds quite some learning possibilities, as you can watch games already played, view chess lessons and participate in one of the tournaments FICS often holds! In case if you would want to play different kinds of chess, like antichess, Miniature allows that too.
 
A great client for every chess player, or just somebody who would want a nice game while waiting for the bus to arrive, Miniature is definitely worth checking out.

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Note: The steps we go through this how-to include modifying low-level system files. Changing the loading bar is done at your risk, do not attempt if you think that you might mess something up or if you don’t understand some parts of this how-to.

Want to make your boot sequence more cooler? Maemo allows you to change the loading bar that appears at startup.
First, we want to go root:
sudo gainroot
Next, backup the files we want to change:
cd /usr/share/icons/hicolor/scalable/hildon
mkdir /home/user/MyDocs/Bar_Backup
cp indicator_update* /home/user/MyDocs/Bar_Backup
Now, for the fun part. Create your own loading bar images. You may use the originals as a base, you would want 8 PNG images with a size of 192×48, alpha-channel is optional. You can look at this custom loading bar set, for example. Name them all as indicator_update?.png, with ? going from 1 to 8, in the order you want the images to appear.
Drop all the images to /usr/share/icons/hicolor/scalable/hildon
cp -f [your images] /usr/share/icons/hicolor/scalable/hildon/
Once done, try rebooting your phone and checking out if all went smoothly.
Enjoy!

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Sometimes you just really need for a certain command to be executed every X minutes. Or maybe you could use something that will notify you to check your bags every hour. Not a problem, Alarmed will help you with that.
Alarmed is a little GUI app that allows you to schedule any sort of event to be done at a certain time, pretty much like cron, an utility well known to every *nix administrator.
Install alarmed:
sudo gainroot
apt-get install alarmed
Once launched, you’ll see a screen with all your currently scheduled events and buttons for creating new events, removing and editing current events.
Creating a new event is simple with a user-friendly interface of Alarmed: press a button, chose what exactly will be done at that event and schedule a time.
Easy and effective, now you don’t need to constantly remind yourself to walk the dog or switch your profile to silent when you’re at a conference.

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Do you like strategy games? Well, then you probably have heard of “The Battle for Wesnoth”, a popular free software turn based strategy game with a strong, Tolkienesque fantasy setting. But did you know that there is a complete port of this PC game for Maemo?

The game is currently available in Extras, you can find it in the Games category.
sudo gainroot
apt-get install wesnoth
Note that the game is pretty large and will consume about 240~ Mb of memory on your /opt Unpacking a large package can also take a lot of time, so make sure you have enough battery charge.
Optionally install the music files. (Not recommended as this will take up 100 Mb more of memory and will slow down the game a bit):
apt-get install wesnoth-music
Once installed, you can launch the game from your applications menu or with
wesnoth
Loading times can be a drag, but apart from that and a few resolution issues with menus, the game is completely playable. Add-ons, Multiplayer, Singleplayer campaigns are all functional. I was able to both finish one of the mainline campaigns and play co-op survival on the official server without any trouble, right with an N900 in my hand.

The Battle for Wesnoth is definitely a game every N900 gamer should take a look at. So install the package and dive into the world of dwarves, elves and orcs!