Engima Rising Tide for Free

Enigma: Rising Tide is a well-received naval simulator that has now been released for free by the developers as reported by Rock, Paper, Shotgun. The iso which can be downloaded here. It's the Gold version of the game which lacks a number of minor options and doesn't have a soundtrack but otherwise is the same as the retail version. The developer who released it has stated that they'll get around to updating it to the retail version eventually.