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.

ResourceGuru - The fast, simple way to schedule people, equipment, and other resources online.

RescueTime - Time management software that shows you how you spend your time & provides tools to help you be more productive.

Float - The leading resource management software for agencies, studios, and firms. With a simple, drag and drop interface and powerful editing tools, Float saves you time and keeps projects on track.

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.

When I Work - When I Work is an employee scheduling and communication app using the web, mobile apps, text messaging, social media, and email.