Open Source Dart Messaging Platforms

FluffyChat is a free, open-source instant messaging application built on the decentralized Matrix communication protocol. Developed with Flutter, it provides a modern messaging experience across mobile, desktop, and web platforms. Users can exchange text messages, images, documents, voice recordings, and other media through private or group conversations. The application supports end-to-end encryption to protect message contents and provides encrypted chat backups. FluffyChat includes video calling through Matrix RTC, location sharing, and push notifications. Its community features support public channels, group moderation, custom stickers, and Matrix Spaces for organizing conversations. With a customizable Material You interface and multilingual support, it offers a privacy-focused alternative to centralized messaging services.

Mixin Messenger is a free, open-source messaging application designed for secure communication across desktop and mobile devices. Its Flutter-based client supports Windows, macOS, Linux, and iPadOS. The software uses the Signal Protocol to provide end-to-end encryption for messages, photos, audio, and shared files. Users can participate in private conversations and group chats while maintaining control over their communication privacy. It supports voice calls, disappearing messages, and customizable chat settings. Desktop authentication uses QR code pairing with an existing mobile account. The application also provides message delivery indicators, contact management, and sticker sharing. Unlike the mobile wallet, the desktop version focuses on encrypted messaging rather than cryptocurrency management.

BlueBubbles is a free, open-source messaging application that brings Apple's iMessage experience to Android, Windows, Linux, macOS, and web browsers. It connects to a companion server running on a Mac with an active Apple account to relay messages between devices. Users can send and receive text messages, images, videos, and other attachments. The application supports group conversations, message reactions, read receipts, and delivery information. Optional private API integration enables additional capabilities, including typing indicators, message effects, and advanced group management. Users can personalize the interface with themes and different visual styles. Built with Flutter, BlueBubbles provides cross-platform messaging while retaining the Mac-based infrastructure required for iMessage connectivity.