REVA Crew provides MLS listing services to Realtors on a per listing basis. What are MLS listings? MLS is the system that Realtors use to create electronic profiles of homes they are selling. Sitting around in the office to plug housing information in this system is the last thing Realtors want to do. They want to be on the road in front of clients making sales. We are there to help Realtors achieve this.