Toggl - Toggl is an online time tracking tool. It features 1-click time tracking and helps you see where your time goes. Free and paid versions are available.
Folder Marker - Change folder color in two mouse clicks for easy at-a-glance identification.
RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.
Teorex FolderIco - FolderIco allows to change the color of Windows folder in one click!
Clockify - Simple and free time tracker. Perfect for small and mid-sized businesses as well as freelancers. Unlimited projects and users, unlimited productivity. Get all the premium functionalities, completely free.
Folder Painter - Folder Painter is an easy to use Portable Freeware program, which allows you to change the color of the icon representing a chosen folder to any color you like