WhatRuns - Extension that helps you identify technologies used on any website at the click of a button.

Checklistomania - Centrally managed todo lists for complex processes

Checklist Generator - Create checklists for free and host them wherever you want.

Pipefy - Pipefy is a process management software that empowers anyone to create and automate efficient workflows on their own without code.

listshare - Create beautiful, interactive lists to share with the world.

Trello - Infinitely flexible. Incredibly easy to use. Great mobile apps. It's free. Trello keeps track of everything, from the big picture to the minute details.