Auth0 Token Vault handles secure token storage, exchange, and refresh for external providers so you don't have to build it yourself.
Rolling your own OAuth token storage can be a security liability. Token Vault securely stores access and refresh tokens from federated providers and handles exchange and renewal automatically. Connected accounts, refresh exchange, and privileged worker flows included.
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Native application identity and user-based security for your Azure cloud
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The Web Appointment Scheduling System (WASS) is a system for scheduling and managing appointments over the Web. WASS includes a comprehensive system for creating/displaying appointment schedules, and an email and iCal appointment notification facility.
I haven't looked at this in a while, so use at your own risk.
Appointment Keeper is a web-based appointment scheduling system intended for small medical offices. It allows for multiple providers and a variety of searching and sorting functions.
Narra Appointment Scheduler is an online web-based, multipurpose, multilingual appointment scheduler. The project itself is purely javascript and will work independently with any server-side scripting language and database.