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There are several ways developers use to earn money from their free apps:

Publish free and paid versions:

It's quite common that developers publish their apps in two forms: free and paid. Paid versions are usually come with Pro or HD in their names. In free version, the authors can put a link to the paid version on iTunes or Play Store.

The free version acts as a "decoy". If users are satisfied with an app, they can buy a Pro version for more features. The main advantage of this method is that free apps tend to be downloaded 10 times more than paid apps.

Money Lover, for an example, is an app published in free and paid versions. The free app has been downloaded 600.000 times, in which about 7000 users decide to buy the paid version (~$5 USD) and $35.000 goes to author's pocket.

In-App Purchase


Optional purchase inside apps is a good way to earn money compared to selling apps with cheap price (e.g. $0.99). 49/50 apps having highest revenue in USA App Store belong to this category. For instance, on average Clash of Clans earns $3.000.000 USD per day in 2013 with In-App Purchase.

Ads

Displaying banner ads in apps is also a common way to earn money in free apps. To earn money with this method, yours apps should have a a lot of traffic. Flappy Birth is supposed to earn about $50.000 USD per day from more than 50k downloads.

Two big ad systems are iAds (Apple) and Admod (Google). On average, authors receive $2 USD for 100 downloads.

CPI (Cost per Install)

This is a quite new method to earn money with mobile apps. Users will see some "pop-up" in games or apps about "Install Now" for other apps. Usually, $0.8-$3 USD is paid for 1 app installation from CPI companies.

Funds

You can also try to raise funds for your apps from donors. If you have a nice idea, you can find funds from companies. In return, you can add companies' logos or names in your apps.

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Although the game has been withdrawn from sale on Apple App Store and Google Play, many people still play it on their phones. This post doesn't tell you how to play this game and gain high score but how to get rid of ads as I guess some people may feel bothersome because the ads keep displaying while playing.


You can remove the ads easily by turning on "Airplane mode" before playing. Without Internet connection, the ads won't appear anymore and you can enjoy the game more :-) In the case you still see the ads in Airplane mode, restart the app.

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Some useful shortcuts for users using Yahoo Messenger:

MESSENGER 

Ctrl + shift + F8 : My Disaplay Image
Ctrl + shift + P : Preferences
Ctrl + shift + D : Sign out to Mobile device
Ctrl + D : Sign out
Ctrl + Q : exit

CONTACTS 

Ctrl + shift + A : add a contact
Ctrl + H : Show online contact
Ctrl + tab : Show messenger list

ACTIONS

Ctrl + M : send message
Ctrl + L : Call computer
Ctrl + H : Call a phone number
Ctrl + T : send SMS
Ctrl + Y : send email
Ctrl + shift + C : send contacts
Ctrl + shift + M : send messenger list

HELP : F1

Others

Alt+A Open my Account web page.
Alt+C Show the Call menu off of the split drop down menu control.
Alt+D View/Edit Contact Details.
Ctrl+Shft+L Alt+E End Call.
Alt+H Alt+R Hold/Resume.
Ctrl+L Alt+L Call PC/Call Back.
Alt+M Mute/Unmute.
Alt+S Save to Address Book.
Ctrl+M Send an IM.
Ctrl+T Send a Text Message.
Ctrl+Y Email.
Ctrl+K Call a Telephone Number.
Ctrl+N Start a Conversation.
Alt+V Volume (In the Volume window: Up and Down arrow keys and Home and End keys change the volume instantly, Enter and Esc close the Volume window.

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MacUpdate now gives away 9 Mac software:

1. Backblaze: backup data online. Free 3 months ($15)

2. Grappler ($20): download music and movie on Internet

3. Color Strokes ($3): photo editor with wonderful color mixing

4. LightFrame ($30): add frames to your photos

5. Photo Batch ($15): batch photo processing (auto contrast, rename, rotate, ...)

6. Video Rotate ($3): edit and rotate videos

7. Data Guardian ($20): 448-bit data encryption/decryption

8. MacCleanse ($20): clean your Mac

9. SnapNDrag ($6): screen capture utility with 1 key press

It takes less than 1min to register. First, go to https://deals.macupdate.com/freebundle/affil/8055, click "Create Account" and provide your basic information. Then, go back to previous page and choose "Add to Cart" to buy the free package. Finally, download software and serials.

Source: 9to5mac, MacUpdate

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Nandroid backup is a backup of a running ROM (OS, configurations, personal data, apps) of an Android device. Nandroid backup is very important for users who update ROM frequently.

Usually, to create a Nandroid backup, you need to use ClockWorkMod or TWRP Recovery. However, this approach is rather time consuming. Now with Orange Backup, you can create a Nandroid backup and save it to cloud storage easily.

This app only runs with rooted devices having busybox v1.2 or later installed. With this app you can create Nandroid backup on the fly and you don't need to restart you devices. The progress is simple with clear instructions. You can also set back-up schedule with this app. In addition to Nandroid backup, the app also provides some other features: uninstall or freeze apps and talk killer.



You can download Orange Backup for free on Play Store:

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Adobe introduces a special promotion event that you now can download the whole Creative Suite 2 for free without any requirements.

Creative Suite includes all necessary software for editing photo, video, web, ... CS2, which was released in April, 2005, contains Photoshop CSP (9.0), Audition 3.0, Acrobat 3D 1.0, Acrobat Pro 8.0, Illustrator CS, InCopy CS2, InDesign CS and Adobe Premiere Pro 2.0.

The free CS2 is compatible with Windows (XP or later) and Mac OS X (only v.10.2.8-v.10.3.8, PowerPC® G4 or G5 processor). Therefore, Mac users must run Snow Leopard or earlier and install Rosetta to run CS2.

Download Adobe CS2 (free)

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Here is a list of good programs for Mac OS:

1. Office software iWork: Pages, Keynote, Number

Pages

Pages is a good alternative of Microsoft Word on OS X. With Pages, you can add comments for paragraphs or sentences. Pages also supports a lot of beautiful templates.
Download Pages (9.99 USD)

Keynote

This is "Powerpoint" program from Apple. It provides many beautiful effects for presenting.
Note: Keynotes effects may not work well after being converted to Powerpoint.
If you have iPhone, you can use remote control with Keynote Remote app.
Download Keynote (9,99 USD)

Numbers

It is similar to Microsoft Excel. It supports many kinds of graphs.
Download Numbers (9,99 USD)

All software in iWork are integrated with iCloud. You can edit files with iPad and iPhone.

Of course, you can download the famous Microsoft Office for Mac OS (148,99 USD).

2. Note software - Evernote

It is the best cross-platform app for taking notes. The notes can be syned and edited on iOS, Windows Phone, Android, Blackberry OS. With Evernote, you can attach photos and audio files easily.
Download Evernote (free)

3. Task management - Wuderlist

Wunderlist 2.0 has good interface and data sync. You won't miss a task again because tasks are synced seamlessly to iPhone, iPad, Windows Phone, Android or Blackberry OS devices. With labels, folder, list, you can manage tasks easily with Wunderlist.
Download Wunderlist (free)

4. Chatting software - Adium

Adium supports many kinds of chatting accounts (Yahoo, Facebook, AOL Instant Messenger, MSN Messenger, ...) and therefore you don't need to download many apps to your computer. It also has a easy-to-use and beautiful interface. All emoticons of Yahoo Messenger can be displayed with Adium.
Download Adium (free)

5. Download management software - iGetter

A must-have app for OS X because it downloads apps, games and video very well. You can also use this app in web browsers. It also allows users to select Internet network to optimize download speed.
With the free software, you may need to wait about 10s every time you run it.
Download iGetter (free)

6. Searching - Alfred

You may use Spotlight to run an app. However, Alfred is a better app to find and run application on your Mac. You can input any query (such as ph for photoshop) in to Alfred to find app. It also supports searching on Google, Amazon or Wikipedia in a simple way.
Download Alfred (free)

7. Cloud service software - Google Drive, Dropbox, SugarSync, SkyDrive (free)

With these services, you can store, view and edit files on any devices. On OS X, Dropbox runs very well and it is integrated with gallery on iOS. When you capture an image on iPhone, the image will be sent directly to Dropbox and you can view on Mac easily.
Download Google Drive
Download Dropbox
Download SugerSync
Download SkyDrive

8. AppDelete

You can remove any app with AppDelete. It can find and delete any files related to the removed app. To delete an app, just drag-drop it to AppDelete icon.
Download AppDelete (3,99 USD)

9. Photo editor - Photoshop, GIMP, Paint FX

Photoshop CS6 and GIMP are 2 powerful software for editing photos. You can also use Paint FX for some basic photo editing functions.
Download GIMP (free)
Download Paint FX (2,99 USD)
Download Photoshop CS6 (700 USD)

10. Feed reading - MixTab

There are many good news reading apps out there (Reader, Feeds, FeedBoard, ...). I prefer MixTab due to its beautiful interface. It manages information with tabs and fully suports trackpad on mac and therefore you can read news easily. You can also share news via Twitter or Email.
Download MixTab (free)

11. SopCast

If you want to watch sports, use SopCast. It is stable and provides high quality videos.
Download SopCast (free)

If you think more apps should be added to this list (e.g. Parallels), please add in the comment.

(tinhte.vn)

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Ann Video Converter is a good software to convert video between formats. It supports all popular video formats (WMV, MPEG, AVI, MPEG-1, MPEG-2, MPEG-4, DVD, VCD, SVCD, MOV RM, MP4, RMVB...). You can also convert your video to a MP3 file with this software.

Ann Video Converter also supports some simple video editing functions (cut, crop, watermark, change brightness, add title, ...). It costs 39USD but now you can get it for free.

First, go to http://www.annvideo.com/promotion.htm and copy the Register Code:

Then, click "Get it Free" and "Download Now" in the next page. After installing the program, you can activate it with the Register Code above.

And enjoy

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PC Tools Privacy Guardian is a security software that can clear browsing history, cookies, passwords, temp files, ... It costs 19.99USD to use for one year (maximum 3 personal computers). However, you can get the latest version for free:


Company: PC Tools (Symantec)
License: free from PC Tools
Size: 15.9MB/Windows XP/Vista/7/8

To register a free license, go to http://www.pctools.com/privacy-guardian/offer/ and input your name, address and email.


Check your email from  do-not-reply@pctools.com with title PC Tools Privacy Guardian License Information.

Save License name and License code to activate the software later. Click on the link to download the latest version. In the installation progress, input License information into the dialog "Before we get started..."

With only 6 minutes, this software can free more than 1.4GB space for your PC.
(ref: xhtt.com.vn)

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Some Windows users don't want to move to Linux because they cannot run their favourite Windows programs. However, "PlayonLinux" (http://www.playonlinux.com) provides us a great solution to install and run Windows programs on Linux as native Linux programs, i.e. program icons are placed on the desktop. PlayonLinux is developed based on Wine with a simple interface for installing/removing applications. On Ubuntu/Kubuntu/Linux Mint...,  you can install PlayonLinux in Software Center/Manager. A simpler way is to open Terminal and run the command:

sudo apt-get install playonlinux

Run PlayonLinux, you can see its interface:


PlayonLinux installs each application to a virtual drive stored in ".playonlinux/wineprefix". In Configure, you can find virtual drives on the left and each virtual drive has it own settings, registry and frameworks.
You can install more frameworks,  such as .NET, DirectX, Adobe/Air, in "Install packages" tab.
You can also set Render engine in Display tab.

To install a new Windows application, click Install button and follow steps:
1)  choose an app
2) install
3) specify a new virtual drive or select from available ones
4) choose setup file to install
5) create shortcut for this app
That's it!



If you encounter problems with heavy apps or games, you can find more information at http://appdb.winehq.org/

You can play some heavy Windows games e.g. Diablo III and Skyrim on Linux:


(ref: tinhte.vn)

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1. CursorFX:

http://www.stardock.com/products/cursorfx/downloads.asp
- 13 categories of cursors

- quickly change to the default cursor with "Ctrl + Shift + C"

- many effects and sounds for mouse actions

- easy to change size and color of cursors in "Settings"

2. RealWorld Cursor Editor:

http://www.rw-designer.com/cursor-maker

- generating cursor files (.cur or .ani) from images (GIF, PNG, BMP, JPG)
- many tools for drawing and editing
- compatible with all Windows versions

3. AniTuner:

http://www.gdgsoft.com/anituner/
- easy to create, edit and covert .ani files
- simple and easy-to-use interface
- you can preview and export to different file formats (Animated GIF, Adobe Flash, Clip AVI, Bipmap Strip)
- compatible with all Windows versions

4. Change Cursor:

http://www.rw-designer.com/change-cursor
- the default cursor can be replaced with any .cur or .ani files on your computers
- thousands of free cursors from the web to select
- you can change cursor directly in the software
- supporting 32 and 64-bit Windows

5. DotMouse:

http://download.cnet.com/DotMouse/3000-2317_4 10068477.html?tag=main;dropDownForm
- you can create new mouse cursors from GIF images      
- 20 free built-in cursors

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If you have an Android smartphone, you can increase Dropbox storage to 23GB free for 2 years by using Dropbox apk.

1. Delete Dropbox app on your Android smartphone (if available) and download the Dropbox 23GB apk to your phone or SD card. Then, install this app.

2. Click on “Continue to Dropbox”, click “Next” and log-in with your Dropbox account (register a free account here if you don’t have one).

3. After a few minutes, you will have 23GB in your Dropbox!

And you will receive an email from Dropbox:

Enjoy!

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Update: you can find a simpler way to archive this goal at Easy method to convert APK (Android) to BAR (Playbook)

This post shows you 8 steps to convert an Android app (.apk) to Playbook app (.bar).

Step 0 : download file apk2bar-HaTaX.zip here

Unzip this file into apk2bar folder. This folder will contain:
+ apk2bar-HaTaX.bat –> convert .apk file to .bar file
+ signbar-HaTaX.bat –> used to sign .bar file
+ bin folder –> tools to get *.p12

Step 1: (download Android SDK)

Download Android SDK at http://developer.android.com/sdk/index.html

Step 2: ( Install Android SDK)

Setup Android SDK and remember its path. Run SDK Manager. Click SDK platform in Android 2.3.3 (API10) as follows


Step 3: ( Edit path in apk2bar-HaTaX.bat)

Using notepad to edit file apk2bar-HaTaX.bat to change the path "ANDROIDSDK=" to Android SDK installed in step 2.

Note: remove “\” after android-sdk

Step 4 : (Testing) convert APK –> BAR

This step tests above steps. If you drag file *.APK into file apk2bar-HaTaX.bat and obtain file *.bar without errors, you have done correctly.

Step 5 : (Register to receive file *.csj  (not *.p12))

Go to website :https://www.blackberry.com/SignedKeys/ to register to receive file and go to https://www.blackberry.com/SignedKeys/ to register another file.
Note: in the input PIN part, you can input any characters but you must remember it.
After registering, you may need to wait about 2 hours to receive 2 files *.csj.
- First file client-PBDT-xxxxxxxx.csj (x: client number)
- Second file client-RDK-xxxxxxxx.csj (x: client number)

Step 6 : get file *.p12

Step 6.1 : Open cmd.exe and change to \apk2bar\bin (in step 0) and copy files *.csj into this folder
 
Step 6.2 : In cmd, type:
blackberry-signer  -csksetup  -cskpass <create_a_password>

If you already had key, an error will occur.
CSK file already exists. Use -cskdelete to delete first
Don’t use command cskdelete to delete unless you forgot pass. If you forgot pass, you can delete CSK file and request new CSJ file from RIM.
Step 6.3 : Next, input
blackberry-signer -register -csjpin <PIN>-cskpass <csk password from step 6.2><CSJ_file>

Note: PIN is the PIN number in Step 5.
In Step 5, we register 2 keys because we will get errors if using only one key.
Step 6.4: Input
blackberry-keytool -genkeypair -keystore -storepass –dname "cn=" -alias author
 
Step 7: Config file signbar-HaTax.bat
Using notepad to edit file signbar-HaTaX.bat. Only edit the first part of this file.
 
SET DEVCERTFILE : the path to *.p12 file created in Step 6.4.
SET DEVCertPASS : pass to protect file *.p12 created in Step 6.4
SET CSKPASS : pass CSK created in step 6.4.

Step 8 : sign file bar

Step 8.1 : Drag file *.apk into file apk2bar-HaTaX.bat to create file *.BAR
Step 8.2 : Drag *.bar created in Step 8.1 to file signbar-HaTaX.bat to sign file *.bar.

Done!
(ref: tinhte.vn)