Best Open Source Chat Software 2026

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Browse free open source Chat software and projects below. Use the toggles on the left to filter open source Chat software by OS, license, language, programming language, and project status.

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Yeastar: Business Phone System and Unified Communications
Go beyond just a PBX with all communications integrated as one.

User-friendly, optimized, and scalable, the Yeastar P-Series Phone System redefines business connectivity by bringing together calling, meetings, omnichannel messaging, and integrations in one simple platform—removing the limitations of distance, platforms, and systems.

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1

ADAMANT Messenger Progressive Web App

ADAMANT decentralized Messenger, progressive web application

A messaging application client for ADAMANT Blockchain. ADAMANT is a decentralized anonymous messenger based on the blockchain system. It’s independent of any governments or corporations, and even developers due to the distributed network infrastructure that contains an open-source code. The ADAMANT blockchain system belongs to its users. Nobody can control, block, deactivate, restrict or censor accounts. Users take full responsibility for their content, messages, media, and goals and intentions of using the messenger. Privacy is the main concept of ADAMANT, neither phone numbers nor emails are required. Apps have no access to the contact list or geotags, IPs are hidden from chatters and paranoids can use Tor app. All the messages are encrypted with the Diffie-Hellman Curve25519, Salsa20, Poly1305 algorithms and signed by SHA-256 + Ed25519 EdDSA. Private keys are never transferred to the network.

Downloads: 8 This Week

Last Update: 2025-08-02
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2

Status - a Mobile Ethereum OS

A free (libre) open source, mobile OS for Ethereum

Status is a secure messaging app, crypto wallet, and Web3 browser built with state-of-the-art technology. Integrated into one powerful super app for private secure communication. Safely send, store and receive cryptocurrencies including ERC20 and ERC721 tokens with the Status crypto wallet. Only you hold the keys to your funds. Status' intuitive design protects you and your funds from attacks. Status uses an open-source, peer-to-peer protocol, and end-to-end encryption to protect your messages from third parties. Keep your private messages private with Status. Browse the growing ecosystem of DApps including marketplaces, exchanges, games, and social networks. The latest security standards ensure a private browsing experience. You will never be asked for a phone number, email address, or bank account when generating a Status account. Stay private and selectively reveal yourself to the world with Status.

Downloads: 4 This Week

Last Update: 2025-10-24
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3

bitchat

bluetooth mesh chat, IRC vibes

bitchat is a decentralized peer-to-peer messaging app that operates over Bluetooth mesh networks, enabling local group chats without the need for internet, servers, or phone numbers. It is designed with privacy and security in mind, offering encrypted private messages and channels alongside a public local chat that requires no registration.

1 Review

Downloads: 23 This Week

Last Update: 2025-07-18
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4

Metis Messenger

Secured blockchain group messaging

We’re all familiar with using our favorite chat apps and we often just assume we can trust them with our personal information. It’s not until our private life is compromised do we suddenly reconsider how we’re doing things. Next-generation chat application Metis improves your privacy by defaulting to locally encrypt all communications before sending any message. With Jupiter Metis, you always have the power over your privacy and what, if anything, is shared. No central servers store any information about you, your account, or conversations. There’s no signup required and participating in group chats is as simple and secure as it gets. Metis runs on the blockchain and is 100% encrypted with AES encryption. By using blockchain to talk, you’re protecting your communications and keeping your chats private!

Downloads: 0 This Week

Last Update: 2022-02-02
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Empower Your Contact Center with Human-Like AI Conversations
Deliver faster resolutions, lower costs, and better CX without hiring another agent.

Enterprise Bot, based in Switzerland, is a pioneer in Conversational AI, Process Automation, and Generative AI. With the trust of esteemed enterprise giants across industries like Generali, SIX, SBB, DHL, and SWICA, Enterprise Bot is revolutionizing both customer and employee experiences. Through its advanced integration with Large Language Models (LLM) such as ChatGPT and Llama 2, and its unique patent-pending DocBrain technology, the company delivers unparalleled personalization, active engagement, and omnichannel solutions across platforms like email, voice, and chat. Furthermore, Enterprise Bot integrates with existing core systems, such as SAP, CRMs, Confluence and more, and with its proprietary middleware, Blitzico, enables the AI to not only respond to queries but also take action to resolve them. This dedication to innovation in four main use case areas, Customer Support, Sales and Marketing, Knowledge Management and Digital Coworker, elevates both CX and employee productivity.

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