AppFlowy is a collaborative project/wiki/documentation platform (similar to Notion if you are familiar with that). Otherwise check out their screenshots for an idea of how it works.

New Features

Desktop

• Private page sharing: Add members to private pages with Can View or Can Edit permissions
• Guest editor collaboration: Invite non-members (guest editors) to collaborate in real-time on your pages
• Shared with me: Browse all pages shared with you under the new Shared with me section
• New syncing protocol: Optimized for faster, more reliable multi-user and multi-device data sync

Mobile

• Shared page collaboration: View and edit pages that have been shared with you on iOS and Android
• New syncing protocol: Optimized for faster, more reliable multi-user and multi-device data sync