Fleet management systems developed by maritime software specialists are powerful management tools for shipping companies. There are such a variety of providers and such a broad range of functionalities that finding the most suitable offers can be difficult. This market review provides insights into the latest market developments and gives an overview of the current providers, products and their respective features. Due to the great interest of previous years, this fourth edition is an extensive update of the versions released in 2011, 2013 and 2015, now considering 38 providers of fleet management software. Besides informing about applications for planned maintenance, financial management, safety/quality/risk and compliance, procurement, voyage management and operations as well as charter management, it takes a closer look at applications for crewing and weather routing.