FreeBusy is described as «Online scheduling assistant to coordinate meetings 10x faster with contacts inside and outside your company. Works with all calendars (Google, Office 365, Exchange, iCloud, Yahoo, etc). Works on web, smartphone, desktop, using voice, chat, and email» and is a appointment scheduler in the office & productivity category. There are more than 10 alternatives to FreeBusy for a variety of platforms, including Online / Web-based, SaaS, iPhone, Android Tablet and iPad. The best alternative is Doodle, which is free. Other great apps like FreeBusy are Calendly, Cal.com, Koalendar and FullCalendar.FreeBusy alternatives are mainly Appointment Schedulers but may also be Calendar Apps or Group Chat Apps. Filter by these if you want a narrower list of alternatives or looking for a specific functionality of FreeBusy.