GTT is a to-do list/diary/journal tool that can track the amount of time spent on projects, and, among other things, generate reports and invoices based on that time.
It's being used to keep shopping lists, organize ideas, track bug reports, keep a diary of activities, do some blogging, provide weekly status reports to management, and even as a consultant billing system.
The reason it can be used for all of these things is that it supports five basic, simple features:
* Multiple To-Do Lists
* A pair of Diary/Journal areas
* A Running Timer
* A Billing Status dialog
* A half-dozen different HTML Reports
Website: