365 Tomorrows is a flash SF fiction site; a great source for inspiring quick ideas.
A Crash in the History of Black Science Fiction by Nisi Shawl
Atlas of the Universe will help you develop a sense of proportion about things.
Atomic Rockets is a good layperson's site for realistic starship designs (and the math and physics behind them)
Blue Room Archive Search Engine - Search the original Tekumel email list archives
Classic Traveller Character Generator - Developed by Stan Shinn and Paul Gorman
Conceptships is one of a family of blogs devoted to SF artwork (ships, robots, aliens, etc.). Great inspiration for your campaign!
Eclipse Phase PDFs - Posted for free download by the designer
Encyclopedia of Science Fiction - John Clute's masterwork
FASA Star Trek Links -
- The Transporter Room for Eric Mornes' Excalibur campaign - many FASA Trek links
- STSTCS - Links to ship stats and many other things
- Vintage Starships - lots of designs, many with downloadable PDFs
- Star Trek LCARS Blueprints - not FASA-specific but a useful source of ship blueprints
- Vulcan Names - not FASA-specific, but you when really need a complete list of Vulcan names (as well as a site specializing in Vulcan philosophy) this is it.
Hill Cantons blog is posting information about his Space Cantons Traveller campaign. Hill Cantons has also posted a Space Cantons house rules and setting Information document which has a fascinating description of the setting.
In depth interview with Iain M. Banks about The Culture
Information on the Milky Way
Let's Read Links for Many RPGS - Includes Eclipse Phase and Nova Praxis
List of the Milky Way's Satellite Galaxies
List of the Nearest Stars
Map of the Moon - Walter Goodacre's 1910 map of the moon (very detailed)
Map of Victorian London - Zoomable down to individual houses
Orion's Arm Universe Project is a collaborative world-building project on a massive scale.
Our Generation Ships Will Sink - KSR on gen ships
Paratime Design's Creative Commons Starship Blueprints
Porky's Expanse also publishes content for Rogue Space, as well as all sorts of other thought-provoking SFnal content for discerning gamers.
Rogue Space is the home for a very lean, minimalist SF RPG that evokes the classic SF of the 50s and 60s.
Science Fiction Hobby Games - a book updating the RPG entries in John Clute's Encyclopedia of Science Fiction (by the author of those entries in the Encyclopedia)
SF Calculators can be found here for hard SF games. For example, use this site to calculate how fast a cylinder must spin to generate a certain amount of gravity.
SF Gateway - You can't go wrong with the SF Gateway, the home to Gollancz Masterworks of Science Fiction classics.
Timeline of the Distant, Disturbing Future
Traveller Subsector Generator is Alex Schroeder's online star sector generator for use with Traveller. Methinks it is readily adoptable to other games.
Twenty quick questions for your scifi campaign - by Exonauts!
Weird Adventures Index - Links to all posts for the Weird Adventures RPG setting on author Trey Causey's blog. You can also see all of our Fate-based posts for Trey's Weird Adventures here.