Startup Return Calculator - How much money can your startup investment make you?
Harpoon Revenue Goal Calculator - Freelancers, how much money do you need to make?
KnightOS - An open-source OS for calculators
Hourly Rate Calculator - Find out your ideal hourly rate
Quarterly Tax Calculator Bot - Quarterly tax calculation for freelancers
Startup Equity Calculator - Figure out how much equity to grant new hires in seconds.