Self-Hosted Custom Communications: 68 Open-Source Apps

ClickClack is a self-hostable team chat platform for people, bots, and agents with a Go server, web app, CLI, and TypeScript SDK.

FusionPBX is a web-based multi-tenant PBX and VoIP server platform built on FreeSWITCH for business telephony, call center, voicemail, fax, and conferencing use cases.

An open source instant messaging transport that lets users chat across different IM networks.

AnyCable is a realtime server for reliable two-way communication over WebSockets and SSE.

Notifo is a multi-channel notification service for sending and tracking notifications across web, email, mobile push, SMS, and other channels.

Flexisip is a modular, scalable SIP server suite for routing calls, presence, conferencing, push notifications, and SIP trunking.

Tiledesk is an open source live chat and customer support platform with integrated chatbots and multi-channel messaging.

Simple, fast, and reliable chat server powered by Matrix.

PushBits is a relay server for push notifications that sends messages via a simple web API and delivers them to users through Matrix.

Web-based GUI that controls and manages Asterisk.

Software framework for decentralized, peer-to-peer networking.

Universal communication platform which preserves the user's privacy and freedoms.

Transit class4 softswitch(SBC) with integrated billing and routing engine and REST API.

WorkAdventure is an open-source platform for creating customizable collaborative virtual worlds and virtual offices with avatar-based interaction and video chat.

Community-driven Matrix homeserver, the continuation of conduwuit focusing on user experience and new features (fork of Conduit).

Matrix Venator - versatile capital Matrix homeserver written from scratch in mautrix-go

Online whiteboard, audio/video conferencing, screen sharing, shared code editing and optional session recording/playback.

Web-based, end-to-end encrypted email platform that uses an independent PKI.

Platform for your corporate communications, based on the advanced architecture, with support for UltraHD video conferencing, built-in messenger with personal and group chats, and a free version for up to 1,000 users.

Instant messaging and collaboration tool with private and group chat rooms, continuous voice and video meetings, files sharing, issue tracking with integrated task board (alternative to Slack).