Spacecraft Exchange
The spacecraft exchange is a place where users can submit and purchase finished spacecraft designs and assemblies. It is accessible from the Spacecraft (F9) window's Exchange tab.
It provides a lot of options for a published design. For example, you can allow other users to copy or not copy the design, set a purchase price, and other parameters that affect what other people can do with them. All designs published here are visible by everybody accessing the exchange.
On purchase of a design, it is added to your inventory as a ship design disk. From this, it can be manufactured at a spacecraft factory.
Designs burned to a disk straight from the designer are not published here.
Website Version
A view only version of the Exchange also exists on the Shores of Hazeron website. It lists designs published for access by everyone, regardless of empire.