TribeScale Alternatives

A messaging app for teams who see through the Earth!

ScudCloud - Slack for Linux. Contribute to raelgc/scudcloud development by creating an account on GitHub.

PlaySMS is a free and open-source management software that offers a flexible web-based mobile portal system that can be made to fit multiple services such as SMS gateway, bulk SMS provider and personal messaging systems etc.

Wiggio is an online toolkit that makes it easy to work in groups. With Wiggio you can:

handy and feature-rich enterprise multi-device messenger available for server or cloud – Slack-like, but not Slack-limited

Rocket.Chat is a Web Chat Server, developed in JavaScript, using the Meteor fullstack framework.

Crugo is a simple group collaboration platform for your team

A newly open sourced self hosted Slack like alternative for building persistent chat communities

Team Communication for your 'extended' team across company boundaries - clients, partners, vendors etc.

Where developers come to talk.

Secure Anonymous SMS in the cloud (and a phone number)

Your own business messenger.

Mattermost is an open source alternative to Slack.