A great tool for hexcrawl and dungeon delving time tracking, either for a 4 week/season 3 watch/day calendar or as a 3 month/season standard-year calendar (first box down the line is the first 4 week month, second box being the second 4 week month, and the third being the last 4 week month of that season).
The extra note space is great for reminders on when the barbarian hordes are going to attack, important festival days, and the moon cycle notes are great for planning the best night for when that cult's going to be performing a ritual.