WP Engine - Hassle-Free WordPress Hosting
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.
Flywheel - WordPress hosting and management built for designers and agencies.
Nintex - Cloud-based digital workflow management automation platform
Truly WP - Premium Managed WordPress Hosting
ProcessMaker - ProcessMaker is an easy to use BPM and workflow software solution. It is used to design, automate, and deploy business processes of any kind.