TaxJar - TaxJar simplifies sales tax filing for eCommerce sellers.
Kissflow - Kissflow is a workflow tool & business process workflow management software to automate your workflow process. Rated #1 cloud workflow software in Google Apps Marketplace.
Vertex Cloud - Vertex Cloud offers sales and use tax automation solutions.
Pipefy - Pipefy is a process management software that empowers anyone to create and automate efficient workflows on their own without code.
Thomson Reuters ONESOURCE - ONESOURCE tax software and solutions synchronize every aspect of your work and link international, country, state and local tax laws.
Process Street - Create beautiful rich process documents in a simple to follow checklist format. Fast, free and incredibly simple to use.