You can track fitness/exercises as well, but it subtracts burned calories from your total for the day (which is why I don't use that feature).
I used to use FitDay, but prefer Daily Plate. There are a gazillion others out there, it's about personal preference I guess.
I dig their weekly calories bar chart and macro-nutrient pie chart, cool stuff. There's a simple line graph that tracks your weight as well.
What do you use and why? Post a comment here.