Super simple concept - just as you doing the Season Journey click on a task to keep an overview of what you have done and what still needs to be done. The status is saved in a cookie. Pay attention to the in-game popups because you can complete many season journey objectives that aren't even visible yet, so this website might help you to keep an overview.
A few observations/PSAs about the season journey:
If you're only in for the stash tab, do not augment your gear with a rank 30 gem for "Destroyer"; instead, augment a rank 40 gem since you need two of those for "Conqueror".
Similarly, if you want to go for Guardian, do not augment your gear with anything below rank 50. In fact, you might just complete the entire Season Journey including the solo rift and leveling 3 gems to 65 70, and in the end put those three gems on your gear - and be done with the season journey. Saves you the additional 38-50 rifts to level the 3 "augment" gems to 50.
For Chapter II you need to enchant something at the Mystic, and for Chapter IV you need to enchant a socket into a weapon. If you enchant a socket into any rare weapon it covers both (the Mystic can enchant weapons at level 2 which costs only 1000 gold to upgrade).
As usual, feedback welcome. Also, I have to say a huge thanks to the DFans crew and in particular Monstrous for providing feedback to earlier versions (my inability to create good designs made it look like it was created by a rainbow puking CSS monkey).
To-do list that I might go over (or not):
Nothing right now (in the far future responsive/mobile web design, but no immediate plans for that since on mobile you lose the main idea I had: to see the entire Journey on one screen)