Mattermost

1. Download and install Mattermost, then create a workspace and choose Cloud or self-hosted deployment. 2. Sign up or sign in, create or join channels, and invite teammates via email or shareable links. 3. Send messages and files, use threads to keep discussions focused, and search to find people and content quickly. 4. Connect tools like GitHub, GitLab, Jira, or Jenkins, and set up slash commands and notifications to automate workflows. 5. Use boards to track tasks and playbooks to standardize processes such as releases or incidents, then configure permissions, retention, and compliance settings as needed.