Checkfront - Checkfront is built for Tour & Activity Operators, Rental companies and Accommodation providers. Manage your inventories online, centralize reservations, process payments and get unified access to leading distribution channels.
Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.
Doodle - Make meetings happen. With Doodle, scheduling becomes quick and easy.
EssentialPIM - EssentialPIM is a free Personal Information Manager that keeps up with the times and lets you manage appointments, tasks, notes, contacts, password entries and email messages across multiple devices and cloud applications.
Calendly - Say goodbye to phone and email tag for finding the perfect meeting time with Calendly. It's 100% free, super easy to use and you'll love our customer service.
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.