Best Self Hosted Alternatives to Gitter

Mattermost is an open-source, self-hosted collaboration platform designed for secure team communication and real-time collaboration in high-stakes environments. It supports flexible deployment options, including on-premises or private cloud setups, with enterprise-grade security, governance, and integration capabilities.

Key Features

• Self-hosted deployment with high availability for mission-critical use
• Native audio calls and screen sharing within channels
• Interoperability with external tools (MS Teams, GitLab, Atlassian) and native playbooks
• Open-source Team Edition licensed under MIT
• Data control, granular admin and deployment flexibility (air-gapped networks, on-prem/private cloud)
• Real-time DevSecOps collaboration with integrated playbooks and automation

Use Cases

• Integrated Security Operations and incident response coordination
• Real-time DevSecOps collaboration to accelerate software delivery
• Self-sovereign collaboration and data governance for regulated environments

Limitations and Considerations

• Team Edition is intended for small teams and is not recommended for government or sensitive workloads

Conclusion: Mattermost offers a secure, self-hosted collaboration platform with deployment flexibility and strong integration capabilities, making it suitable for organizations needing data control and mission-critical workflows.

Zulip is an open-source team chat platform designed for both real-time and asynchronous communication. Its distinctive topic-based threading keeps conversations organized, making it easier to follow multiple discussions without losing context.

Key Features

• Topic-based threading within channels (streams) to keep discussions focused
• Inbox-style view to prioritize unread conversations
• Real-time messaging with searchable history
• Powerful integrations and bots, including webhook-based workflows
• Granular permissions and administration for organizations and communities
• Multi-platform clients, including web, desktop, and mobile apps

Use Cases

• Team communication for engineering, product, and operations groups
• Open source or community collaboration with many parallel discussions
• Async-first coordination across time zones while preserving context

Zulip is a strong fit for teams that want the immediacy of chat without sacrificing long-term clarity. Its conversation organization model scales well as the number of channels and active threads grows.

Tailchat is an open source “noIM” (not only instant messaging) team collaboration app that combines chat with an extensible platform for integrating tools and workflows. It supports multi-group workspaces, panels for organizing topics, and a plugin-centered approach for customization.

Key Features

• Real-time messaging with multiple message types (text, links, mentions, images, files) and reactions
• Workspace and group structure with panels to organize conversations by topic
• Inbox-style notifications for mentions and plugin events
• Plugin center for extending the UI and embedding tools (e.g., whiteboards, conferencing, utilities)
• Bot and open platform integrations via simple URL requests or OpenAPI apps
• Built-in RBAC permission system with roles and permission points that plugins can extend
• Optional AI assistant features such as rewriting, simplifying text, and summarizing chat history
• Multi-platform support with web-based UI and dedicated clients for native capabilities

Use Cases

• Replacing Slack/Discord-style chat for teams that want deeper customization
• Building an internal collaboration hub by embedding third-party tools through plugins
• Adding automation and notifications from external systems using bots and OpenAPI

Limitations and Considerations

• The third-party developer interfaces and plugin APIs may still evolve and can introduce breaking changes over time

Tailchat fits teams that want a modern chat experience but also need a flexible integration and extension model. Its plugin system and RBAC design make it suitable for both small groups and larger, structured organizations.

Openfire is an open source real-time collaboration server that implements the XMPP (Jabber) protocol for instant messaging and presence. It is designed to be straightforward to deploy and administer while supporting scalable, standards-based messaging.

Key Features

• XMPP server for messaging, presence, and roster management
• Web-based administration console for configuration and user management
• Multi-User Chat (MUC) support for group chatrooms
• Extensible plugin architecture to add features and integrations
• TLS support and configurable authentication options for secure deployments

Use Cases

• Self-hosted team chat infrastructure based on open standards (XMPP)
• Embedding XMPP messaging in custom applications and products
• Running private group chat services for communities, schools, or organizations

Openfire is a mature XMPP server with an active ecosystem, making it a solid choice for standards-based messaging deployments that need extensibility and administrative control.

Stoat is an open-source chat and community platform (formerly known as Revolt) that provides text channels, direct messages, role/permission controls, moderation tools, and rich media support. The project is implemented as a modular Rust backend with companion services and a web-native client, designed for self-hosting and community-focused deployments.

Key Features

• Modular Rust-based backend split into multiple crates (REST API, WebSocket events, file server, proxy, daemons) for separation of responsibilities and scalability.
• Deployable with Docker Compose and Nix; includes Dockerfile and compose examples for local and production deployment environments.
• Integrates common infra components documented in the repo: MongoDB for primary storage, Redis for transient/cache needs, MinIO (S3-compatible) for file storage, and RabbitMQ for messaging/queues.
• Provides WebSocket and REST APIs, presence and event servers, a file server with S3-compatible storage handling, and Tenor proxy support for GIFs.
• Web and desktop clients are supported; the repository and docs reference a web client workflow (build with Node/Yarn tooling) and platform downloads.
• Fine-grained permissions, moderation and bot support aimed at community management; emphasis on privacy and GDPR-aligned practices.

Use Cases

• Host community servers for gaming, hobby, or interest groups requiring channel-based chat and moderation tools.
• Private team or organization chat deployments with self-hosted infrastructure and custom integrations.
• Custom deployments that need S3-compatible file storage, event-driven messaging, and WebSocket-based real-time updates.

Limitations and Considerations

• Real-time voice/video features have historically been limited or under active development; audio/voice support may be experimental or staged and can require additional infrastructure (example configs reference LiveKit).
• Federation with external networks is not implemented by default and has been indicated as low priority; cross-server federation is not a built-in feature.
• Self-hosting requires multiple supporting services (MongoDB, Redis, MinIO, RabbitMQ) and moderate operational knowledge; resource and orchestration planning is necessary for larger deployments.

Stoat is a production-focused, open-source alternative to proprietary chat platforms, built primarily in Rust with container-first deployment patterns. It targets communities and teams that want control over their data and infrastructure while providing modern chat features.

Conduit is a lightweight, open-source Matrix homeserver implemented in Rust. It targets easy setup and low system requirements by shipping as a single binary with an embedded database (RocksDB by default) while also supporting a SQLite backend for smaller installations. (conduit.rs)

Key Features

• Single self-contained binary for simple deployment and low overhead.
• Implemented in Rust and built on Ruma and the axum web framework for modularity and performance. (gitlab.com)
• Default RocksDB storage engine with an optional SQLite backend; configurable cache and DB tuning options. (famedly.gitlab.io)
• Docker and systemd packaging examples and deployment guides; configuration via a conduit.toml file (TOML-based). (famedly.gitlab.io)
• Focus on core Matrix features with ongoing improvements and a changelog documenting protocol/version updates and fixes. (conduit.rs)

Use Cases

• Small personal or family Matrix homeserver on low-resource hardware (Raspberry Pi, single-board computers).
• Lightweight team or community chat server that needs easy setup and minimal maintenance overhead.
• Developers and administrators who prefer a single-binary Rust implementation for embedding or custom deployments.

Limitations and Considerations

• Project is marked beta: some Matrix features and federation edge-cases are incomplete (examples historically include certain E2EE federation behaviors and outgoing presence/read-receipt handling). Users should evaluate feature gaps against their needs before production use. (github.com)

Conduit provides a compact, Rust-native alternative to heavier Matrix homeservers, prioritizing simplicity, performance, and low resource usage while continuing to close feature gaps and improve federation behavior.

Libervia is a modular communication and social platform built on the XMPP protocol. It provides a shared backend and multiple frontends (including a web interface) to deliver messaging and social features in a unified, extensible system.

Key Features

• XMPP-based architecture leveraging the open, federated messaging ecosystem
• Multiple user interfaces, including a web frontend (Libervia Web)
• Real-time chat and contact management via XMPP
• Social features often associated with "social networking" use cases (implemented through XMPP extensions)
• Extensible, plugin-oriented design to add or customize features

Use Cases

• Run a self-managed team chat and messaging service using XMPP
• Provide a federated communication platform for communities or organizations
• Build custom XMPP-powered apps by extending the backend and exposing tailored frontends

Limitations and Considerations

• Feature availability can depend on XMPP server support and enabled XMPP extensions
• A full deployment typically involves multiple components (backend, XMPP server, and chosen frontends)

Libervia is best suited for users who want an open-protocol communication stack with the flexibility of multiple interfaces. Its XMPP foundation and modular design make it a strong choice for extensible, federated messaging and social functionality.