Ocean Wolf
A line boat that was on an intercontinental cruise was hijacked. There were a lot of rich people aboard. The terrorists who have a lot of military vessels at their disposal hijacked this watercraft. Your mission is to destroy all of the terrorists and save hostages' lives. ... From time to time you are supplied with ammunitions from the air. ... If you collect different objects, you will get additional arms and scores. ... An armed ship is your sword of justice.
http://www.enjoyfreegames.com/files/oceanwolfsetup.exe - 2Mb - Download - Screenshot

Sea Wolves
? The most part of dry land disappeared under the water in result of chain man-caused cataclysms. The planet was flooded with disgusting monsters. And the ruthless pirates have seized the power over survived people? You are the captain of a frigate and you? ... re furrowing the boundless seas. ... The sea way is full of dangers and as the captain of your own pirate bands, you should load your ships, explore unknown territories, attack your opponents, amass gold, upgrade armour and etc.
http://www.alawar.com/submit/SeaWolves.exe - 16Mb - Download - Screenshot