Mattermost

Mattermost is a free and open-source alternative to Slack. It’s a secure and flexible team communication platform built for organizations that need control over their data. Mattermost supports real-time messaging, file sharing, and workflow automation, and can be self-hosted for maximum privacy. It’s ideal for technical teams working in high-security or mission-critical environments.

Key features include:

• Adaptable Integrations: Extends collaboration with custom apps and industry-standard tools.
• Focused Workflows: Deep integrations, integrated playbooks, and native audio calling.
• Robust Security: Compliance features ensure data control and security.
• Resilient Infrastructure: Supports self-hosted, private cloud, and high-availability deployments.

Use cases include:

• Integrated Security Operations
• Self-Sovereign Collaboration
• Mission-Critical ChatOps
• Real-Time DevSecOps Collaboration