Designing a 3D look software box

Select rectangle tool from tool palette.

Create a rectangle using rectangular shape tool.

Double click the layer to open layer style window. Apply settings as shown.

Create a very thin rectangle using rectangular shape tool. .

Type the name of software using big bold font. Select one of the words using text tool and fill it with the different color.

Double click the layer to open layer style window. Apply settings as shown.

Insert same text again. Apply same layer style. We'll use it for the left hand side of the software box.
Press Ctrl+T. Right Click and select Rotate 90° CW.

 

Place it as shown.
Duplicate the layer and place it on the top for the top lid of the software box.

Using custom shape tool (U), create a shape 10Point Star.
Draw a star shape using this tool. These type of shapes comes handy when you have to introduce a discount or a scheme etc.
Type "money back guarantee" and place right above the star shape.
Insert an image of company mascot and place as shown below.
Type more text using interesting font and styles as and where required.
In layer palette, Select all layers except the background layer. Press Ctrl+T to merge this layers. Create a duplicate of the merge layer. Create a rectangular selection using rectangular marquee tool. This area will be the left side of the software box. Press Shift+Ctrl+J to cut paste the selection in a new layer.

In layer palette again select the main merged layer and create a rectangular selection using rectangular marquee tool. This area will be the top side of the software box. Press Shift+Ctrl+J to cut paste the selection in a new layer.

Similarly Select the front portion of the software box and separate it out in new layer. Delete the layers below with what ever portion they are left with.

Select the layer with the left portion of the software box. Press Ctrl+T. Right Click and select Skew.
Adjust the handles as shown below.
Select the layer with the top portion of the software box. Press Ctrl+T. Right Click and select Distort.
Adjust the handles as shown below.
Select the layer with the front portion of the software box. Press Ctrl+T and stretch towards right and bottom .
Press Ctrl+T. Right Click and select Skew.
Adjust the handles to align the corners with top portion as shown.

Keep adjusting the handles will you get the proper 3D look. It will take a little hit and trial to achieve the look but once you do it we will realize that it's worth it.

Double click the layer to open layer style window. Apply settings as shown.
Apply same layer style on top and left layer too. Select all the three layers. Press Ctrl+T. Right Click and select perspective. Drag the bottom handles inside to achieve the final look as shown below.