Open Source Skype Alternatives

Rocket.Chat is an open source communication platform built for organizations that can't hand their data to a third-party cloud. It brings together real-time messaging, voice and video calls, screen sharing, and AI-assisted workflows into a single environment you host and control entirely.

Security is central to the design. It supports on-premises, air-gapped, and secure cloud deployments, and has been used on classified U.S. government networks including NIPRNet, SIPRNet, and JWICS. It holds DoD Authorization to Operate (ATO) up to Impact Level 6. Few commercial team chat tools come close to that clearance level.

Beyond defense and intelligence, it fits any organization where data sovereignty matters: government agencies, critical infrastructure operators, financial institutions, and enterprises subject to strict regulatory requirements. The Swedish Electrical Safety Board and EU agency eu-LISA both use it for secure internal and cross-organizational collaboration.

Core capabilities include fully encrypted conversations, granular access controls, fine-grained data retention policies, and comprehensive audit logs. Federated communication lets teams coordinate across organizational or jurisdictional boundaries without routing data through external services.

The architecture is extensible. Teams can install pre-built apps or build custom integrations to fit specific workflows, without being locked into a vendor's roadmap. If you want something lighter, Mattermost is a comparable self-hosted option worth considering. The built-in AI features handle routine tasks and surface relevant information during active conversations — for teams that want a standalone AI layer instead, LLMChat takes a different approach.

Nextcloud is an open source, self-hosted file sync and share platform that allows organizations to store, share and collaborate on files securely.

Key features include:

• File sync and sharing across devices
• Real-time document collaboration
• Video calls and chat
• Calendar, contacts and email integration
• Advanced security and access control
• On-premises hosting for full data control
• Customizable and extensible through apps

Nextcloud is designed for organizations that need secure file sharing and collaboration while maintaining control over their data. It can be deployed on-premises or with a trusted cloud provider.

Some key benefits of Nextcloud:

• Improved productivity through integrated collaboration tools
• Enhanced security with end-to-end encryption and granular permissions
• Compliance with data protection regulations like GDPR
• Lower costs compared to proprietary cloud solutions
• Flexibility to customize and extend functionality

Nextcloud is used by thousands of organizations worldwide, including major enterprises, educational institutions and government agencies. It provides a powerful yet easy-to-use platform for secure content collaboration.

Element is a powerful, open-source communication platform that puts privacy and security at the forefront. Built on the decentralized Matrix protocol, Element offers a comprehensive suite of features for both personal and professional use.

Key benefits of Element include:

• End-to-end encryption: Ensure your messages, calls, and shared files remain private and secure.
• Decentralized architecture: Choose your own server or self-host for complete control over your data.
• Cross-platform compatibility: Seamlessly sync conversations across desktop, web, iOS, and Android devices.
• Rich collaboration tools: Enjoy group chats, voice and video calls, file sharing, and integrations with popular productivity apps.
• Interoperability: Connect with users on other Matrix-based platforms, fostering open communication.
• Customization options: Tailor the interface and features to meet your specific needs or brand requirements.
• Community-driven development: Benefit from continuous improvements and innovations from a global developer community.

Whether you're an individual seeking secure messaging or an organization looking for a flexible, scalable communication solution, Element provides the tools you need to stay connected while maintaining control over your data and privacy.

Wire delivers military-grade security without sacrificing user experience. The platform features always-on end-to-end encryption for messages, files, and calls, while maintaining an intuitive interface for seamless team collaboration.

Key capabilities include:

• Instant messaging, file sharing, and video meetings with invisible security
• Flexible collaboration tools for internal teams and external partners
• Complete data sovereignty with on-premises deployment options
• Enterprise features like SSO, SCIM, and granular admin controls

Trusted by industry leaders including BMW, ExxonMobil, and government organizations worldwide, Wire ensures your sensitive communications remain private and compliant. The platform is particularly valuable for organizations requiring:

• Zero-knowledge encryption
• Regulatory compliance
• Digital sovereignty
• Scalable secure collaboration

Secure and private by design, Twake Chat leverages the Matrix protocol for decentralized communication that puts you in control. This free and open source messenger delivers enterprise-grade security with end-to-end encryption while maintaining simplicity for both work and personal use.

Key features that set Twake Chat apart:

• Multi-platform bridges - Connect with contacts across Telegram, Discord, Signal, and 30+ other networks through a single interface
• Flexible deployment - Use cloud-hosted or deploy on-premise for maximum data control and privacy
• Cross-device synchronization - Access your conversations seamlessly across tablets, smartphones, and laptops
• Multi-account support - Switch between personal and work accounts within one unified interface
• Corporate integration - Connect with contacts from phone books and corporate directories via SSO
• Jitsi video integration - Built-in quality videoconferencing capabilities

Perfect for professional teams who need secure communication without compromising on functionality. The Matrix protocol ensures your data remains decentralized rather than controlled by a single entity, while customizable security levels let you add extra encryption when needed.

Whether you're managing team collaboration or need a reliable messaging solution that respects privacy, Twake Chat provides the security and flexibility modern organizations require.