You probably already know http://custom-fields.com, my latest tool to list all custom fields inside an organization. The site just evolved with a new feature: the first custom fields marketplace!
Because I think custom fields are awesome and provide great value, I thought it would be great to be able to share a field with others. Whether the field is very long to create, or is very well thought, the marketplace is the place to go to share your fields! Contact me to add yours, and feel free to share any feedback!