scheduling

Cal.com is an open source scheduling infrastructure and Calendly alternative. It provides comprehensive features for managing appointments, scheduling, and calendar integration with a focus on privacy and customization.

QloApps is a free and open source hotel management and reservation system that provides a complete Property Management System (PMS), booking engine, and hotel website builder to help hotels manage their operations online.

Rallly is an open-source scheduling and collaboration tool designed to make organizing events and meetings easier by finding the best date and time based on participants' availability.

Easy!Appointments is a highly customizable web application that allows customers to book appointments through a web interface, with features like Google Calendar sync, email notifications, and multi-language support.

Hi.Events is an open source event management and ticketing platform that helps sell tickets online for all types of events, from conferences and workshops to club nights and concerts.

Dagu is a powerful Cron alternative with a Web UI that allows you to define dependencies between commands as a Directed Acyclic Graph (DAG) in a declarative YAML format. It provides advanced workflow orchestration for complex task automation and scheduling.

Alf.io is an open source ticket reservation system for events, conferences, workshops and meetups. It provides comprehensive features for managing event attendance with a focus on privacy and security.

Donetick is a task and chore management tool designed for personal and family use. It features advanced scheduling, flexible assignment capabilities, group sharing, detailed history tracking, automation via API, and a simple, modern design that makes household management effortless.

Seatsurfing is an open source desk and room booking system that enables organizations to manage flexible workspaces, hot desking, and meeting room reservations through a modern web interface.