Clearbit Connect - Clearbit Connect is a free extension that surfaces actionable information on the people who email you.
Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
ProsContras - Create Pro's & Con's Lists with ease.
TaskPaper - Plain text to-do lists for Mac
Hunter - Find all the email addresses related to a domain
Magnetic - Magnetic is an all-in-one agency management software built for productivity.