OpenSlides

Online appointment scheduling system.

An open-source, customizable and intuitive web-based hotel reservation system and a booking engine.

Create polls to vote on dates and times (alternative to Doodle).

Allows your customers to book appointments with you via the web.

Event management and ticketing platform for conferences, concerts, and more. Offering customizable event pages and embeddable ticket widgets.

Feature-rich event management system, made @ CERN, the place where the Web was born.

Ticket reservation system.

Event management tailored to free Software conferences.

Web-based event management, including running a Call for Papers, reviewing submissions, and scheduling talks. Exports and imports for various related tools.

Web-based conference planning and management system. It helps to collect submissions, to manage talks and speakers and to create a schedule.

Webbased app to book seats, desks and rooms for offices.