Fluxer is an instant messaging and VoIP platform designed for friends, groups, and communities. It combines real-time chat, voice and video communication, and community-focused spaces with channels, permissions, and moderation tools.
The software can be self-hosted on your own hardware, and the official clients provide access from the desktop and the browser.
This is free and open source software.
Key Features
- Real-time messaging with typing indicators, reactions, and threaded replies.
- Voice and video calls in communities and direct messages, with screen sharing.
- File sharing, link previews, image and video attachments, and GIF search.
- Communities with text and voice channels organized into categories.
- Granular roles and permissions for managing communities.
- Moderation tools with audit logs, webhooks, and bot support.
- Search message history and use a quick switcher to move between communities and channels.
- Upload custom emojis and stickers for your community.
- Apply custom CSS themes along with compact mode and display options.
- Self-host your own instance and switch between multiple instances.
- Cross-platform support – runs under Linux, macOS, and Windows.
Website: fluxer.app
Support:
Developer: Fluxer Platform AB
License: GNU Affero General Public License v3.0

Fluxer is written in TypeScript. Learn TypeScript with our recommended free books and free tutorials.
Related Software
| VoIP Software | |
|---|---|
| Jitsi | Innovative open source voice and video conferencing |
| Mumble | Voice chat application for groups |
| Jami | SIP-compatible softphone and SIP-based instant messenger |
| GNU Gatekeeper | Feature-rich project that implements an H.323 gatekeeper. |
| Fluxer | Instant messaging and VoIP platform |
| Kamailio | Build large platforms for VoIP and realtime communications |
| FreeSWITCH | Telephony platform for voice and chat driven products |
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| Wire | Encrypted instant messaging client |
| Galene | Easy to deploy videoconference server |
| Linphone | Voice over IP softphone, SIP client and service |
| Janus | General purpose WebRTC server |
| Baresip | Modular SIP user-agent |
| OpenSIPS | Mature SIP server |
| FusionPBX | Multi-tenant PBX platform for managing VoIP communications |
| GOnnect | Easy to use VoIP client |
| Calls | Make phone and SIP calls |
| qTox | Chat, voice, video, and file transfer IM client |
| FreePBX | Web-based interface for managing Asterisk telephone systems |
| Flexisip | Modular SIP server suite for VoIP and real-time communications |
Read our verdict in the software roundup.
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Hi Steve. Fluxer is cross-platform. Regards.
Hi Torin. Thanks, article updated.