Airtable - Airtable works like a spreadsheet but gives you the power of a database to organize anything. Sign up for free.
Avalara - Cut tax compliance costs, not corners. Avalara automates tax compliance and can help improve accuracy while reducing costs.
FriendlyData - Communicate with databases like a human
TaxJar - TaxJar simplifies sales tax filing for eCommerce sellers.
SpreadsheetDB - A database that you can query with spreadsheets
Thomson Reuters ONESOURCE - ONESOURCE tax software and solutions synchronize every aspect of your work and link international, country, state and local tax laws.