Hurdlr - Simple financials for busy entrepreneurs
neo.tax - automated R&D tax credits for startups = extra month of burn
Halfdollar - Free and elaborate spreadsheet budgeting.
Stripe Atlas Taxes - Help file your business taxes
Bonsai - One platform to streamline your entire business
Quarterly Tax Calculator for Freelancers - See how much you owe to state and federal in 7 sec