If you enjoy playing K2 in turn-based mode you might like this little aid I've produced. It is a card tracker which allows you to not which cards you and if you like), your opponents have used and the weather tiles. Obviously you wouldn't use this in a face-to-face game, but it seems fair enough to me in a turn-based game. In principle you can see this information in the game log anyway, but I find it a bit easier with this. It's fairly clunky at the moment and I can see ways to improve, but I find it useful.
https://boardgamegeek.com/filepage/2327 ... rd-tracker
Leave comments on BGG if you have suggestions.