This area is a huge one. Some need time tracking to charge a job for, some will be fine with an Outlook Calendar and well, there are so many variations on this theme that I can't help here.
But for me, the Outlook calendar does fine.
Bob
When looking for alternatives like Things for Mac the page shows "Product ranking: #5 in Calendar & Time Management Software". How to I find that product ranking? I'd like to start from the ranking it self instead of wandering around hoping to find the #1 product - but searching for it doesn't help - and even clicking on the "Calendar & Time Management Software" takes me to a HUGE list that has all kinds of none related products listed. It would be a huge help if such a list exsisted and had the ratings/comments etc showing the current version instead of finally realizing I have been reading a 2011 review! Anyone know how to find the current ranking??

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic