Staffjoy V2 - Text message based employee scheduling app
FullCalendar - FullCalendar is an open-source JavaScript event calendar.
Square Appointments - Add an online booking link. Easily embed the customizable widget directly on your website. Any changes to your online scheduling, prices, or services update automatically.
Letsfind - Letsfind is a fast, easy-to-use, ad-free way to create online (meeting) polls.
ONDiGO - Seamlessly integrate your email & calendar to Salesforce
FreeBu - Smart free/busy calendar sharing and meeting organizer.