Distributing your addin as a goomod file:

• allows the user to easily install it with GooTool without needing to run an exe or extract a zip in the right place
• allows the user to easily uninstall it, ensuring that no leftover files remain
• helps ensures your addin does not mess with future 2dboy official updates
• helps prevent conflicts between your addin and others
• allows your addin to be compatible across all platforms, as GooTool takes care of the difference in encryption and PNG file formats
• allows your addin to be distributed through this site
• allows your addin to be automatically downloaded in GooTool (coming soon)

See also: How can I create my own addin?

Check out the addin file format page. For the moment you will need to create a Zip file of the necessary structure by hand and rename it to have a goomod file extension. It is anticipated that a future release of GooTool will have features to assist in addin development.