The Simtropolis Exchange, most commonly referred to as STEX, is a open custom content exchange on Simtropolis. This exchange is open to all talents and allows a custom content creator to upload a map, prop, custom building, modification or a tool. A Rating System was installed to enable users to give a rating on their favourite uploads. You can receive as an uploader up to ten "stars" with the rating system. Currently, the STEX Top Contributors are SimGoober, Pegasus and ill tonkso, with 277, 242 and 226 uploads, respectively.