The first Freelancer was a space trading and combat simulation game developed by Digital Anvil and published by Microsoft, released in March 2003 for PC. The game allowed players to pilot a starfighter and visit many star systems. They can engage in combat with other starfighters to protect traders or engage in piracy themselves. [Infos from Wikipedia]
A sequel, Freelancer 2, was in development by Digital Anvil / Microsoft Game Studio in 2006 for XBOX 360. Codenamed “Project Lonestar”, the game was cancelled when Microsoft closed the studio.