Booked is one of the best calendar applications because it's web based and cloud-based. That means you do not have to install anything in your operating environment, and they handle all of the installation and maintenance needs. Basically, this is a turnkey solution for an unlimited number of users, schedules and resources. It only takes five minutes to be set up and running and there is zero maintenance required on your part. You can choose to keep your domain name or use one they select for you. The professional support makes this application a great business tool and it's a quick download as well.
- 100% free and open source.(GPL)
- OS independent. Only requires a web server running PHP and MySQL.
- Multiple languages and cultures.
- Simple to install in any enviornment with a web-based or manual installation process available.
- Easy to extend with many pluggable components.
- No limits when hosting on your server. Unlimited number of schedules, resources, users and reservations.
- Active support community.
- Easy to use administrative tools make it easy to quickly fine, manage and export data.
- Powerful reporting system.
- Reservation start and end reminders.
- Intutive click and drag schedule view allows users to quickly find and book an available time slot.
- Organize users and limit access by groups.
- Flexible layout configuration lets you set up schedules that fit your needs.
- Limit and control resource usage with a flexible quota system.
- Optionally review and approve reservation requests.
- Integration with Outlook®, Google® Calendar or any other system that accepts .ical files.
- Authentication integration with LDAP, Active Directory, WordPress and more.
- Customizable attributes and fields.
- Tiered roles and permissions.