The best open source alternative to Franz is Station. If that doesn't suit you, our users have ranked more than 50 alternatives to Franz and many of them is open source so hopefully you can find a suitable replacement. Other interesting open source alternatives to Franz are Beeper, Ferdium, Freeter and ElectronIM.
Station is the first open-source smart browser for busy people. A single place for all of your web applications.
Brings together messaging from 14 networks into a single inbox, including WhatsApp, Telegram, Slack, and more, with strong privacy via on-device connections, cross-platform availability, chat reminders, scheduling, and unified notifications for all devices.
Open source cross-platform desktop app uniting messaging, email, productivity, and custom services in a side-by-side interface with easy account-free use, workspaces, built-in Todo panel, resource hibernation, robust privacy controls, and optional multi-device sync.
The smartest way to work on your computer. Freeter is a productivity app that allows you to gather everything you need for work in one place, organized by projects and workflows, and have a quick access to them.
Free open source Electron based multi instant messaging (IM) client.
Combine all your IM applications (or whatever you want) in a single browser (Electron) window.
Empathy is a messaging program which supports text, voice, video chat, and file transfers over many different protocols. You can tell it about your accounts on all those services and do all your chatting within one application.
Productivity browser featuring unified webmail, website, and web app management, isolated multi-account support, vertical sidebar with grouping, memory-saving tab sleeping, app-to-app linking, built-in chat and screenshare, collaboration workspaces, and strong security.
Hamsket is a fork of Rambox that was started when Rambox moved from being totally free to a "freemium" model.
Bridges between a growing number of protocols: mattermost, IRC, gitter, xmpp, slack, discord, telegram, rocketchat, steam, twitch, ssh-chat, zulip, whatsapp, keybase, matrix, microsoft teams, and more with REST API (mattermost not required!).
Speek! is the first messenger that is anonymous and censorship-resistant by design. Speek! messenger encrypts all messages and is secure, private and decentralized.
Fully open source instant messaging server and clients. No proprietary components or non-free dependencies. Backend in pure Go (GPL 3.0), with a command-line administration tool in python + gRPC. Clients for Android, iPhone, and Web - ReactJS (all licensed under Apache 2.0).
Chatter is a centralized platform for chat apps, ensuring privacy and automatic login. Supports WhatsApp, Discord, Microsoft Teams, Telegram, Snapchat, WeChat, and more. Built on Tauri framework requiring Node.js and NPM, offering a seamless multiple chat experience.
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Beautiful design and more easy to configure, right. A lot of apps, right. But, no languages support (only english) and really not consume less ram. On my test : 4 services connected on both (Franz and Station), Station takes about 2,1 Go of Ram ! Franz consume 700 mo. In comparision, I have also 30 opened tabs in Chrome and it consume about 1 Go of my Ram.