I've used Toggl (http://www.toggl.com/ http://www.toggl.com/) and Harvest (http://www.getharvest.com/ http://www.getharvest.com/). I like them both, though they

I've used Toggl (http://www.toggl.com/ http://www.toggl.com/) and Harvest (http://www.getharvest.com/ http://www.getharvest.com/). I like them both, though they are not local apps. But, you can use them on any of the multiple machines you use.