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Evaluator - A simple calculator app for macOS and Windows
TaxJar - TaxJar simplifies sales tax filing for eCommerce sellers.
SumItUp for iMessage - Perform calculations to sum things up
Thomson Reuters ONESOURCE - ONESOURCE tax software and solutions synchronize every aspect of your work and link international, country, state and local tax laws.
unitMeasure - A sleek unit calculator for android
Vertex Cloud - Vertex Cloud offers sales and use tax automation solutions.