Pioneer is a space adventure game set in our galaxy at the turn of the 31st century.
The game is open-ended, and you are pretty free to make whatever kind of experience you want off it. Look for fame or fortune by exploring the millions of star systems. Turn to a life of crime as a pirate, smuggler or bounty hunter. Forge and break alliances with the various factions fighting for power, freedom or self-determination. The universe is whatever you make of it.
Pioneer's source-code is available under the GPL v3 or later, while all the artworks are CC-by-SA 3.0 licensed. This makes Pioneer a Free Software title.