The Site Showcase for Gatsby, developed by a team including Cassie Beckley, Shawn Wang, and Kurt Kemple, is a searchable and filterable library designed to display sites created with Gatsby. This initiative aims to simplify the process of finding open-source Gatsby site source codes and to demonstrate Gatsby's capabilities to potential clients and collaborators. The project emerged from user feedback and research, which highlighted pain points such as the non-searchable and lengthy Awesome Gatsby list and the lack of visual site representations. The Site Showcase addresses these issues by offering features like screenshots, source code access, site sharing, and submission capabilities. The team is seeking community contributions for future phases and has plans to develop a Starter Showcase with additional filtering options.