the author of this app says:
TimeTracker is a time-keeping tool for contract workers, lawyers and anyone else who works on multiple projects on an hourly basis.
You enter the project names and optionally assign each to a client.
Times can be displayed either in hours and minutes, or hours and tenths of an hour.
You can start and stop projects as often as you need to throughout the day and the times are cumulative.
The program is now available in color.