Top 4 Kotlin P2P Projects

unstoppable-wallet-android

12 546 9.6 Kotlin

A powerful non-custodial multi-wallet for Bitcoin, Ethereum, Binance Smart Chain, Avalanche, Solana and other blockchains. Non-custodial crypto and NFT storage, onchain decentralized exchange, institutional grade analytics for cryptcurrency and NFT markets, extensive privacy controls and human oriented design. Implemented on Kotlin.

Project mention: Safest Defi Wallet | reddit.com/r/ethereum | 2022-11-26

There’s also Unstoppable and Airgap. They’re private but not really an defi wallet
meshenger-android

3 326 0.8 Kotlin

P2P Voice/Video phone App for local networks.

Project mention: [request] minimalistic android app with chatting over a LAN | reddit.com/r/fossdroid | 2022-12-03

I saw an app like this recently, turns out its voice/video only: https://github.com/meshenger-app/meshenger-android
Appwrite

appwrite.io
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Appwrite - The Open Source Firebase alternative introduces iOS support. Appwrite is an open source backend server that helps you build native iOS applications much faster with realtime APIs for authentication, databases, files storage, cloud functions and much more!
Near P2P

0 318 0.8 Kotlin

A P2P library for Android for discovery on local networks using UDP and transfer in general using TCP sockets
DecSync CC

5 190 0.0 Kotlin

Android app to sync contacts, calendars and tasks without a server using DecSync

Project mention: Is there any way to sync bookmarks and articles over syncthing? Sort of like a Pocket or Wallabag that doesn't require a server? | reddit.com/r/Syncthing | 2023-01-07

Afaik they use databases, and synching databases is bound to corrupt them. Generally you need a program to be aware that something can be accessing and even writing it's files at any time, as that requires special care (see e.g. for calendars and contacts: https://github.com/39aldo39/DecSyncCC). I'd look for an extension or something to export/import that data to files, which you then can use together with syncthing for a semi-manual process.

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020). The latest post mention was on 2023-01-07.