Dark Star One (DSO) is a simple but intriguing space adventure simulation, not as complex as the X2 or X3 games and not as simple as Free Space. DSO is mission driven but the game play allows you to explore without being jumped at every jump gate for entering a system not on the mission. You can get DSO from Good old games GOG.com for only $9.99 and it
still, it's a old game. I running it on windows XP home edition SP3