I dont use any third party tools other than the forum. I tried thrudds for 2 days and disliked the way the game got truly dumbed down. Pen and paper, my own spreadsheet, which I abandoned months ago (because all the secret blak markets go published on the system maps). No VR, No joystick. No mouse. No voice attack. One year on and I've got some personal logs, notes, my own routes and still playing keyboard only.
This all you need to understand to be a trading wizzard
http://imgur.com/QsxScn1
and you can work that out in about a day and that's all there is to it along with the galaxy map.
Nice one, BUT:
can you really make money with Hydrogen Fuel?
How is it supposed to work - buy from refinery, sell to refinery?
There's no logic.
But it's not only the station trade logic. It's the general price finding.
Except a few commodities all others are that extremely off in their profit margins that it's simply not viable to trade them. When was the last time you've seen a grain trader? A fish trader?
A T9 that gets damaged during an interdiction or a failed interdiction attempt (the ones shortly before a jump, where you crash into the next star) with a load of fish will have higher repair costs than the fish is worth.
So, that's what I am complaining about. If the universe were dynamic, profits for fish would soar as no one trades in fish. But this doesn't happen. Fish is an utterly useless commodity (as are about 80% of them anyways).