You can search for public groups via the experimental SimpleX Directory Service: connect to it via this address.

Mobile apps public beta v5.3 are released:

• delivery receipts
• new layout in groups
• new UX for incognito mode
• etc.

Desktop app beta is now usable, please try it: https://github.com/simplex-chat/simplex-chat/releases/tag/v5.3.0-beta.5