When2Meet - When2meet helps you find the best time for a group to get together. It is a free survey tool that is quick and easy to use.
Meetio Room - Meeting Room Booking System
x.ai - x.ai is a tool to schedule meetings for you and your team.
Resource Central - Meeting room & resource scheduling software for Outlook
WhenAvailable - WhenAvailable is an excellent event management tool that allows scheduling the dinner party, book club meeting, and guys’ night out with simple and best ideas.
Smartway2 - Book meeting rooms, desks & more via mobile/Outlook/desktop