Mongoose Publishing is about to release a new version of the
Traveller RPG. They intend to follow the Traveller Campaign Setting
up with a variety of compatible sci-fi RPGs.

In order to make this all accesible, they have decided to open the
system up. There will eventually be a Traveller SRD, which will be
very useful to anyone making their own tabletop sci-fi game.

However at the moment, they are still in the playtesting phase. They
have released an Alpha version of Traveller called Traveller Playtest
Document v3.2. Here is the URL:
http://www.mongoosepublishing.com/pdf/Traveller%20Playtest%20Doc.pdf

You might need to reassemble that back onto one line if it breaks up.
The PDF is a massive 2.8MB! It doesn't contain OGC at this stage, but
you could probably use it if you want to start converting your own
science fiction universe over to Traveller rules.

I haven't played Traveller myself, but I know that Sparky is a big
fan of it, so I'll be checking it out when it arrives. The fact that
they are doing an SRD will make it much more useful if we ever decide
to convert the VE Universe to Traveller. The system itself is not a
d20 System game, but the character creation rules seem to fit in a
lot better with the sort of thing we have tried to do at VE.