Time Tracker
http://time-tracker.co/

Time Tracker keeps track of time spent on a project or task. The timer will start automatically, no action required. Multiple projects and tasks can be tracked. Simply give the project a name and click ‘Save’. When you move to a new task, start a new timer. Projects are persisted using HTML5 local storage so no save button is necessary. When you close the window all of your projects will be remembered. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog. This will be added to Entrepreneurial Resources Subject Tracer™.