Checklist - Make a list of everything that you need to do during the week with Checklist. The lists that you make can be shared with friends and family on social media or sent in a message.
Submit Checklist - Checklist of directories to submit your startup
Bamzooka - Create checklists, schedule them, assign them to your team
Checklistomania - Centrally managed todo lists for complex processes
Happy Tools by Automattic - A scheduling tool built for distributed teams
The Startup Checklist - 25 steps to a scalable, high-growth business