Bitcoin Optech #227

Damus is a Twitter-like Nostr client for iPhone, iPad and MacOS.

chachi is a nostr relay-based (NIP-29) group chat client that is designed to be mobile-friendly, bandwidth efficient and interoperable with all kinds of content.

Primal is a free and open source nostr client focused on seamless user experience. Available on Android, iOS and the web.

Krux is open-source firmware for building DIY Bitcoin signing devices using off-the-shelf parts. It runs on Kendryte K210 devices like the M5StickV and Maix Amigo, turning them into airgapped devices that can sign transactions for singlesig and multisig wallets.