Here are some great open-source alternatives to IOS and Android.

European:

  1. Ubuntu Touch Germany 🇩🇪
  2. Postmarket OS Europe 🇪🇺
  3. Sailfish OS Finland 🇫🇮
  4. Manjaro Arm Germany 🇩🇪
  5. /e/ OS France 🇫🇷

Non-european:

  1. Graphene OS Canada 🇨🇦
  2. WebOS South Korea 🇰🇷

Come join us at [email protected] to discuss building up the alternatives.