Alternativ till nPOPuk för GNOME med gratis licens

• GNOME
  Alla plattformar Windows Mac Linux Chrome OS Android iPhone Windows Phone Apple Watch Android Wear iPad Android Tablet Windows S Web Self-Hosted Firefox Opera Chromium BSD Xfce Haiku PortableApps.com Chrome Ruby Gmail Adobe AIR GNOME Cloudron OpenPGP S/MIME
• Gratis licens
  Eventuell licens Gratis licens Open Source-licens Kommersiell licens