What is the best productivity software for Mac?

I’m looking for something for task management. I want to be able to manage a to-do list and time how long it takes to do each task…helps to document for a work time sheet. Would be nice to have all that in one program.

“Grindstone” is a program that does this, but it’s only for PC.
There’s also “Things” for Mac, but it does not manage time.

Thanks.