I wrote a perl script to generate solar systems for every star within 15 parsecs of the Sun. I used a copy of the GZG star list spreadsheet from Winchell Chung's web site, and started with the rules for generating solar systems found in the GURPS Space, GURPS Traveller, and Traveller 2300 game books. I learned some basic astronomy, just to backstop some of the fuzziness found in the game books, and came up with a list of the planets orbiting the stars. Of course, I made sure that every non-M-class star has at least one planet that's capable of sustaining human life, because it makes the games more fun when you can have enough colony sites for everyone. :)
These are the planetary characteristics in the list:
Orbit: Orbit number.
Distance: From the star, measured in Astronomical Units (Earth is 1.00 AU from the Sun).
Type: Iceball, Rockball, Desert, Hostile, Garden, Gas Giant, Asteroid Belt.
Diameter: Planetary diameter, measured in miles.
Gravity: Planetary gravity, measured relative to Earth (Earth has 1.00 gravity).
Pressure: Vacuum, Trace, Thin, Standard, Dense, Superdense.
Water: None, Rare, Ice, Oceans.
%: Percentage of water on surface, noted where applicable.
Climate: None, Very Cold, Cold, Temperate, Hot, Very Hot.
Tilt: Axial tilt of planet in degrees.
Moons: Number of moons orbiting planet.
-- Rick Rutherford