Is there virtual LEGO designing software?
The LEGO Digital Designer that was the client/creation part of DesignByMe is Windows or Mac only.

This is regularly updated with the latest sets of parts available through Pick a Brick and similar tools.

It allows you to print off building instructions, or upload your creations to the LEGO site.

Previously, you were able to order a boxed set of your model for yourself, friends or family, however The LEGO Group discontinued this service in January 2012.