Startup Stash - A curated directory of 400 resources & tools for startups
neo.tax - automated R&D tax credits for startups = extra month of burn
StartupResources.io - Tightly curated lists of the best startup tools
Stripe Atlas Taxes - Help file your business taxes
Founded X Startup Stats - Find the best country to build your startup in
Quarterly Tax Calculator for Freelancers - See how much you owe to state and federal in 7 sec