Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
The Startup Checklist - 25 steps to a scalable, high-growth business
TaskPaper - Plain text to-do lists for Mac
Employee onboarding checklist - A checklist to successfully onboard new employees
Magnetic - Magnetic is an all-in-one agency management software built for productivity.
Manager checklist - Cheatsheet of things every manager should do