Alternativas ao PPMessage para Software as a Service (SaaS) com licença de código aberto

• Software as a Service (SaaS)
  Todas as plataformas Windows Mac Linux Chrome OS Android iPhone Windows Phone Blackberry iPad Android Tablet Web Self-Hosted Software as a Service (SaaS) Safari Internet Explorer Wordpress Shopify Chrome Joomla BigCommerce Drupal
• Licença Open Source
  Qualquer licença Licença gratuita Licença Open Source Licença comercial