Ship

Aka Sail Simulator 5.
SS5 is all about hoisting the sails and taming the wind. Setup weather conditions, current direction and wave profiles, and hop aboard 6 types of sloops, yachts and whatnots. Roam freely around 4 environments, test your skills on a match course, or setup a LAN or online multiplayer regatta.

Ship Simulator Extremes is the name of the latest installment in the Ship Simulator series. Additions to the game include new locations (including Antarctica and Bora Bora) as well as new ships (including official licensed Greenpeace vessels) and new dynamic weather and water systems. Following a campaign by members of their growing fanbase, Vstep agreed to include the ports of Dover and Calais (in one environment).

Aquadelic GT is a motorboat racing game with crazy weapons and power-ups. It features a mission-based campaign mode that lets players roam freely around various locations, enter races or complete taxi/delivery tasks to earn cash & reputation.
Also known as Power Boat GT.

Ship Simulator 2008 is a mission-based motorboat simulator which also features free roaming in various locations and weather conditions, multiplayer mode and a mission editor.

Ship Simulator 2006 is a motorboat sim from VSTEP and Lighthouse Interactive. It is the first release of Ship Simulator, and features eight motorboats ranging from water taxis to the Titanic, various weather conditions, and a number of harbors modeled after real-life ones. Gameplay consists of a series of missions in which objectives need to be completed within a certain amount of time.

Virtual Skipper 3 is a sailing sim from Nadeo and Enlight Software. You compete in a series of sailing races with a variety of boats in detailed settings spanning from San Fransisco to Sydney.