#messaging

Stackfield

End-to-end encrypted project management and team collaboration platform. German-hosted with ISO 27001 certification for sensitive business data.

Threema

GDPR-compliant secure messenger from Switzerland offering end-to-end encryption, anonymous communication, and self-hosting options for businesses and individuals.

Mattermost

Open-source team messaging for mission-critical work — self-hosted, air-gappable, with playbooks, AI agents, and integrations for DevOps and defence teams.

Element

Experience secure, end-to-end encrypted messaging and collaboration. A decentralised platform for sovereign communication, offering self-hosting or managed services.

Userlike

Initiate conversations on your website and maintain contact through popular messaging apps. Features website chat, chatbots, GDPR compliance, and WhatsApp integration.

Olvid

Secure messaging app requiring no personal data, phone number, or email. Features end-to-end encryption, cross-platform sync, and unlimited file sharing.

SKRED

Anonymous secure messaging app requiring no phone number or email. Features end-to-end encryption, peer-to-peer calls, and complete privacy control.

Fluxer

Open-source instant messaging platform from Sweden with VoIP, screen sharing, moderation tools, and self-hosting options. Built for friends and communities.

Matrix

Matrix.org provides an open network protocol enabling secure, decentralized messaging and communication across platforms with end-to-end encryption.

VNClagoon

Integrated open-source communication platform with messaging, video conferencing, email, and project management. Secure alternative to mainstream solutions with data sovereignty.