Okay, so I just read a post on The Pirates of Drinax campaign for Traveler by John over at the Wandering Gamist. I still have a fondness for Traveler despite its flaws. It was the first science fiction RPG I played, back around 1978 or so. The character generation process was fun and I had a lot of fun generating planets and building sectors. However we never really found a satisfying way to run a campaign with it. We just did one-shot scenarios. The main concept for Traveler of being the crew of a small merchant trader (a la Firefly) didn't appear to us. Every now and then I pull it out and go over it again for a bit of nostalgia.
But John's post alerted me to The Pirates of Drinax, a free campaign for Traveler by Mongoose Publishing. The concept is that the players accept a letter of marque from a nearly-defunct kingdom which wants to return to its glory days. Essentially they are "legal pirates". It has well done intro information and a set of several adventures. It looks like it would be fun. Check it out.