I'm trying to install the SH3F-plugin, so that I can export my libraries.
After downloading the plugin I searched for the .eteks directory. Not being able to find it, I created a directory under the "Home Folder" that I called ".eteks", then a subdirectory called "sweethome3d" then one called "plugins". I placed the "com"-folder in that last folder.
I then started up SH3D but under "Furniture" there was no "export" option. I copied the files in the "exportsh3f" directory into each directory from ".eteks" down, but still SH3D doesn't show the 'export" option.
To ensure you created the directory at the place, try this tip:
Import an existing SH3F file with Furniture > Import furniture library... menu item.
This will create .eteks/sweethome3d/furniture subdirectory in your home directory with the imported SH3F file in it.
Go to the .eteks/sweethome3d directory, create a subdirectory name plugins in it and copy the ExportToSH3F-1.0.sh3p file into plugins subdirectory.
Finally, relaunch Sweet Home 3D.