What are some alternatives?
ResourceGuru - The fast, simple way to schedule people, equipment and other resources online
Hunter - Find all the email addresses related to a domain
Float - The leading resource planning app 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.
Norbert - Norbert is an online tool that helps you to find anyone’s corporate email address.
When I Work - When I Work is an employee scheduling and communication app using the web, mobile apps, text messaging, social media, and email.
LeadGibbon - Access millions of business contacts, with verified email addresses and phone numbers