Gotify

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

Notification infrastructure for developers.

Platform for secure collaboration across the entire software development lifecycle, can be integrated with Gitlab (alternative to Slack).

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

Customer communication platform (alternative to Intercom and Zendesk).

Zulip is a powerful, open source group chat application.

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.

Instant messaging platform. Backend in Go. Clients: Swift iOS, Java Android, JS webapp, scriptable command line; chatbots.

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

The most private and secure chat and applications platform - now with double ratchet E2E encryption.

Screego is a simple tool to quickly share your screen to one or multiple people via web browser.