Where can I download the source code plug-ins?

[websofter]

What mean the "source code included" on the page in table http://www.sweethome3d.com/plugins.jsp?

[Puybaret]

It means that the source code is also in the zipped .sh3p file with the .class files required to run it. As these plug-ins are small, I preferred to do this way to avoid managing other files that would contain source code.