Ad Astra
Status: No Longer in Development
My Rating: 2.5 Stars
Ad Astra by Richard Baker and David Dye. This is another great visionary site. Ad Astra is a role-playing game with hard science-fiction setting. Believable setting, No faster than light travel, Extrasolar colonies, Strange aliens, and Realistic technology.
The Arcbuilder Universe
Status: Highly Active
My Rating: 5 Stars
Ten thousand years in the past, one thousand years in the future, there is the ArcBuilder Universe. Created by a long vanished civilization, the ArcWays became the key to creating a true interstellar civilization, allowing instantaneous travel between the stars and maintaining all which truly defines a civilization. Yet Mankind is a trespasser to the ArcWays, using them without truly understanding them, and always with a portion of frightened wonder at how powerful a civilization must have been to have created such wonders which seemingly defy the laws of physics. But perhaps even more frightening than the possibility of encountered the vanished ArcBuilder race is the prospect of encountering that force, contained within the ArcWays themselves, which destroyed those Builders.
Big Ideas Grand Vision
Status: No Longer in Development
My Rating: 3.5 Stars
300 years ago humans left for the stars. On the colonies humans have discovered marvels, developed new cultures, changed in new directions - separated by gulfs measured in light-years. But now they are brought together again. Culture clashes with culture, philosophy with philosophy. Technologies recombine into something new, something that can transform humanity or destroy it. Ambitious people plan for the dynamic future. It is a time for... BIG IDEAS, GRAND VISION. Big Ideas, Grand Vision is a role-playing science fiction setting written by Anders Sandberg 1999. It is intended as hard science fiction, dealing with the question "What can humanity become?" It was originally run using the Alternity system, but should work fine in most other general systems.
Epona Project
Status: Nearly Inactive
My Rating: 3 Stars
Created by a team of more than 30 worldbuilding specialists over three years, this is a comprehensive and extremely plausible attempt at describing an alien ecology - a classic of worldbuilding.
Furaha: Life on Alpha Phoenicis IV
Status: Active
My Rating: 4 Stars
"When we at last got within visual range of the fourth planet, we could finally see for ourselves what the sensors had promised us: this planet was utterly unlike the dead rocks we had seen so far; this was something else entirely, something unique. We had found a living planet. Bruyningh and I sat for a long time looking at the slow rotation of the world below us. I think it was at this point that we stopped to call it a planet, or even 'the' planet. From then on, for us, it was the World." From 'Worlds Apart: Natural Histories of Furaha and Earth', by Souren Nyoroge.
Orion's Arm
Status: Highly Active
My Rating: 5 Stars
Orion's Arm. Thousands of years in the future, civilization spans the stars, and humanity has branched into myriad directions. Godlike ascended intelligences rule vast interstellar empires, while lesser factions seek to carve out their own dominions through intrigue and conquest. And beyond the safety of the human-friendly worlds, adventure awaits those prepared to risk all.