Spectrum Chat Alternatives

A messaging app for teams who see through the Earth!

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

A desktop chat client for Discord and Slack

The complete white-label framework for in-app team messaging and collaboration.

freemium

Live life unlimited. Free video meetings and team messaging in one app that works the way you do.

Smoothly Share Content Between Devices!

No need to switch between multiple pieces of software to get through the workday. CHATS: Communicate freely. CALENDAR: Know your team's availability, plan meetings. No more conflicts. TO-DOs: Stay on top of all projects. FILES: All files, one spot.

Step up your game with a modern voice & text chat app. Crystal clear voice, multiple server and channel support, mobile apps, and more.

Mattermost is an open source alternative to Slack.

FreeLists provides the internet community with Free, no-hassle, high-quality mailing lists

Get a T-shirt with your GitHub contribution map on it

A channel or group based chat that is easily set up for casual, short, or serious discussions.

JANDI is a group-oriented messaging platform with an integrated suite of collaboration tools that is tailor-made for workplaces in Asia.