Best Communication - Custom Communication Systems software in 2026

AnyCable

anycable.io

Open source

Realtime server for reliable two-way communication over WebSockets, Server-sent events, etc.

Apprise

hub.docker.com

Open source

Apprise allows you to send a notification to almost all of the most popular notification services available to us today such as: Telegram, Discord, Slack, Amazon SNS, Gotify, etc.

Centrifugo

centrifugal.dev

Open source

Language-agnostic real-time messaging (Websocket or SockJS) server.

Chitchatter

chitchatter.im

Open source

Peer-to-peer chat app that is serverless, decentralized, and ephemeral.

Conduit

conduit.rs

Open source

A simple, fast, and reliable chat server powered by Matrix.

Continuwuity

continuwuity.org

Open source

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

Databag

github.com

Open source

Federated, end-to-end encrypted messaging service for the web, iOS, and Android, supporting text, photos, video, and WebRTC video and audio calls.

Element

element.io

Open source

Fully-featured Matrix client for Web, iOS & Android.

GlobaLeaks

globaleaks.org

Open source

Whistleblowing software enabling anyone to easily set up and maintain a secure reporting platform.

GNUnet

gnunet.org

Open source

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

Gotify

gotify.net

Open source

Notification server with Android and CLI clients (alternative to PushBullet).

Hyphanet

hyphanet.org

Open source

Anonymously share files, browse and publish freesites (web sites accessible only through Hyphanet) and chat on forums.

Jami

jami.net

Open source

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

Live Helper Chat

livehelperchat.com

Open source

Live Support chat for your website.

Mumble

wiki.mumble.info

Open source

Low-latency, high quality voice/text chat software.

Notifo

github.com

Open source

Multichannel notification server with support for Email, Mobile Push, Web Push, SMS, messaging and a javascript plugin.

Novu

novu.co

Open source

Open-source notification infrastructure tool.

ntfy

ntfy.sh

Open source

Push notifications to phone or desktop using HTTP PUT/POST, with Android app, CLI and web app, similar to Pushover and Gotify.

One Time Secret

docs.onetimesecret.com

Open source

Share sensitive information securely with self-destructing links that are only viewable once.

OTS

ots.fyi

Open source

One-Time-Secret sharing platform with a symmetric 256bit AES encryption in the browser.

PushBits

github.com

Open source

Notification server for relaying push notifications via Matrix, similar to PushBullet and Gotify.

RetroShare

retroshare.cc

Open source

Secured and decentralized communication system. Offers decentralized chat, forums, messaging, file transfer.

Rocket.Chat

rocket.chat

Open source

Communications platform that puts data protection first (alternative to Gitter.im and Slack).

SAMA

samacloud.io

Open source

Next-Gen self-hosted chat server and clients.