Happy Tools by Automattic - A scheduling tool built for distributed teams
Roombelt - Roombelt displays details about the current and upcoming meetings right at the confluence room door. Say goodbye to meeting interruptions and double reservations in your office.
Aerotime - Group meetings together and find time for deep work
RobinPowered - Robin coordinates meeting spaces, people, and things in your office. Complete with analytics and insights that uncover usage and help optimize space.
Kin Calendar - The simple and connected calendar
Timekit - The developer-friendly scheduling & booking solution