Linux Softwares to Multi Channel

Mattermost is an open-source, self-hosted platform for secure team collaboration, offering a Slack-alternative with emphasis on data control, privacy, and customizability. It provides a range of communication and project management tools for distributed and technical teams.

Slack is a leading cloud-based platform designed for team communication and collaboration. It offers a central location for conversations, file sharing, and app integrations, enabling teams to work more efficiently and stay connected regardless of location.