Alternativer til PPMessage til Software as a Service (SaaS) med open source-licens

• Software as a Service (SaaS)
  Alle platforme 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
• Open Source-licens
  Enhver licens Gratis licens Open Source-licens Kommerciel licens