Last year, I had mentioned a tip on Howto Run Java Games on Nokia S60 3rd Edition mobiles in Full Screen (352×416) by editing the Manifest.MF file in a JAR archive. Now a free Windows based software has been released that allows you to resize, edit and change the screen resolution of Java based JAR games to any of the following predefined formats : 176 X 208 (Basic) , 240 X 320 (QVGA) and 352 X 416 (Double) right from your desktop. Just select the original and desired screen resolution for the game you want, select the JAR file from your computer and it will automatically make the necessary changes for you.

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(Requires Microsoft .NET Framework v2 for Windows)