Alternativas ao Skeduly para Web com licença de código aberto

• Web
  Todas as plataformas Windows Mac Linux Chrome OS Android iPhone Windows Phone iPad Android Tablet Web Self-Hosted Software as a Service (SaaS) PHP jQuery Windows Mobile Slack Microsoft Office Outlook Chrome Google Calendar Drupal Google Apps Microsoft Exchange Server Apple Calendar
• Licença Open Source
  Qualquer licença Licença gratuita Licença Open Source Licença comercial