TaxJar - TaxJar simplifies sales tax filing for eCommerce sellers.
Clarus RD - R&D tax credit software for small to midsize businesses and their CPAs.
Avalara - Cut tax compliance costs, not corners. Avalara automates tax compliance and can help improve accuracy while reducing costs.
Accountancy and Taxation - ACAT is a nonprofit professional credentialing organization, specializing in accounting and tax credentials.
Thomson Reuters ONESOURCE - ONESOURCE tax software and solutions synchronize every aspect of your work and link international, country, state and local tax laws.
PitBullTax - PitBullTax is a web-based tax resolution software created exclusively for Attorneys, CPAs and Enrolled Agents in the United States.