Tool integrations, plugins, APIs, and webhooks? 
The world’s most extensible and customizable open source platform for technical collaboration
Bring your tools, people, and processes together
Join a community of over 4,000 contributors on a platform built for digital operations.
Integrate your favorite tools so you don’t have to continuously switch between them to get your job done. Build robust processes with visibility and control. Automate routine tasks with deep tool integrations, plugins, APIs, and webhooks that make your work flow.
Powerful functionality, flexible options for every technical team
Robust tool integrations
Get more out of your mission-critical workflows with deep integrations with the most important technical and operational tools in your stack, like GitLab and ServiceNow.
Custom apps
Lightweight, interactive add-ons and customizations written in any language and run on any HTTP-compatible hosting service. Build your own, or browse the app directory
Open APIs
Full API access and docs with language-specific drivers to integrate with your own applications. Build bots, interact with users, and orchestrate workflows via a robust REST API
Plugins
Add powerful customization to the server, desktop, and web apps without contributing to the core codebase. Build your own full featured services (written in Go) or browse the plugin directory.
Features that Technical Teams 
Slash Commands
Turn any channel into a CLI. Use built-in or custom slash commands to execute custom actions directly in the Mattermost UI.
Custom Bots
Deploy interactive bots to issue commands and receive responses directly in a channel. Build your own bot or browse what the community has to offer.
CLI Data Import
Post HTTP requests with JSON payloads into a Mattermost webhook. You can do this using `curl` or use an open source tool, like mattersend to create an integration.
Embed Mattermost
Use the Mattermost API to embed Mattermost into web browsers and web applications. Learn more.
Modify Source Code
Mattermost is open source! Modify server or web app source code to customize Mattermost to meet your specific needs. Learn about forking our open source repositories.
Zapier Support
Mattermost supports Zapier to enable connection to over 700 tools, like Gmail, GitHub, Jira, BitBucket, and Confluence.