Invoice Ninja - Invoice Ninja is a free, open-source solution for invoicing and billing customers.
Profit First Calculator - Calculate business accounts using the Profit First method
Harvest - Simple time tracking, fast online invoicing, and powerful reporting software. Simplify employee timesheets and billing. Get started for free.
Belion - Track your time and calculate your profits.
GnuCash - A personal and small-business financial-accounting software, licensed under GNU/GPL and available for Linux, Windows, Mac OS X, BSD, and Solaris.
FB ads budget calculator - Easily calculate your Facebook ads profit potential