Alternatívy programu UKs Kalender pre Thunderbird s licenciou s otvoreným zdrojom

• Thunderbird
  Všetky platformy Windows Mac Linux Chrome OS Android iPhone Windows Phone Blackberry Apple Watch Android Wear iPad Android Tablet Kindle Fire PlayBook Web Self-Hosted Software as a Service (SaaS) Firefox SeaMonkey BSD Xfce PortableApps.com S60 Chrome Thunderbird Sunbird Install Chrome Extensions Google Chrome to Phone
• Licencia Open Source
  Akákoľvek licencia Bezplatná licencia Licencia Open Source Obchodná licencia