Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
MySQL - The world's most popular open source database
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.
SQLite - SQLite Home Page