Alternativ till 30 Boxes för Sunbird med gratis licens

• Sunbird
  Alla plattformar Windows Mac Linux Chrome OS Android iPhone Windows Phone Blackberry Android Wear iPad Android Tablet Kindle Fire Web Self-Hosted Software as a Service (SaaS) SeaMonkey BSD Xfce PortableApps.com Chrome Thunderbird Sunbird iCloud
• Gratis licens
  Eventuell licens Gratis licens Open Source-licens Kommersiell licens