Stripe Atlas Taxes - Help file your business taxes
Receiptful - Receipts that increase CLTV. Exclusive (early access to PH)
Taxfyle - Stop doing your taxes, leave it to the professionals.
QuickReceipts - A mobile app that automatically tracks, organizes, and stores your digital receipts privately on your device.
neo.tax - automated R&D tax credits for startups = extra month of burn
Keep Your Friends Close - A free e-book about maximizing Customer Lifetime Value