Process Street - Create beautiful rich process documents in a simple to follow checklist format. Fast, free and incredibly simple to use.

Nifty - Manage projects, work, and communications in one place.

Workflow86 - All-in-one platform for automating complex workflows and business operations

Flow - Stop managing projects from your inbox.

Pneumatic - Pneumatic is an SaaS workflow management system designed to make business process management easy and accessible to everyone. Pneumatic emphasises ease of use, iterative development and continuous improvement of business processes.

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.