Carbon Fields - Carbon Fields makes it easy for you to create custom fields for post types, taxonomies,
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.
Pods Framework - Plugin and framework for adding custom fields and custom content types to WordPress.
Nintex - Cloud-based digital workflow management automation platform
WPforms - Drag & drop WordPress form builder
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.