Omni Calculator - Helping you make rational decisions, one calculation at a time.
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.
Bootstrap Money - How much money can you make selling software?
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
MAKE Book - Learn to bootstrap profitable startups the 👨🎤indie way
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.