The Freelance Rate Calculator - Get your minimum viable freelance rate
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.
Worklogs - Easy time tracking for remote teams working on Slack.
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Freelance Rate Explorer - Visualize rates for thousands of freelance designers & devs
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.