CT/MT/MGT hybrid using select parts of T5 now as well.
That is a good starter explanation of my sourcing. In past years I used a lot of GURPS:Space 1st and 2nd editions as they had some good systemless bits in them.
Now I go for less complex cores with the option to add detail as needed.
I started GM Traveller using nothing but index cards for everything, characters. worlds, ships, you name it. As these game aged the amount of paper work as a active GM increased, and my enjoyment went down.
One of the greats moments I have had in the past few years was the release of MgT, my index cards where viable again. I suspect one could get a T5 character on to an index card, so there is hope there.