I've personally been using RescueTime for a long time now. The Premium version is based on a subscription (monthly or annually), so it may not fit your need, but there is also a free version, which is enough in my case. The data is collected automatically from a Desktop application, the dashboard and settings are web-based.

I used TimeSink which is a Mac application available on the Mac App Store. It is a "buy once" application, cheap, light, but does not have so many features. I like the way activity is displayed: every application has its own timeline, so you can really keep track of your day.

I used Time Track Pro for some time. I like the way data is displayed with vertical stacks. The Application is cheap, light, and available on the AppStore, but it hasn't been updated in a while.

Finally there is Timing, also available on the M.A.S.

PS: Due to a lack of reputation, I can not post more than 2 links. See the comments for the other 2.

I've personally been using RescueTimefor a long time now. The Premium version is based on a subscription (monthly or annually), so it may not fit your need, but there is also a free version, which is enough in my case. The data is collected automatically from a Desktop application, the dashboard and settings are web-based.

I used TimeSink which is a Mac application available on the Mac App Store. It is a "buy once" application, cheap, light, but does not have so many features. I like the way activity is displayed: every application has its own timeline, so you can really keep track of your day.

I also used Time Track Pro for some time. I like the way data is displayed with vertical stacks. The Application is cheap, light, and available on the AppStore, but it hasn't been updated in a while.

Finally there is Timing, also available on the M.A.S.