OpenTalk
German-built, EUPL-licensed video conferencing for the European public sector. Self-hosted, GDPR-aligned, and the first VC service to earn Germany's BSI IT security label.
Communication
Category: Communication under Digital Workplace
Rocket.Chat
MIT-core team communication platform: E2EE, RBAC, and air-gapped deployments for regulated industries. Message auditing and HA require the paid Enterprise Edition.
Element
The flagship secure collaboration client for the Matrix protocol. A decentralized, end-to-end encrypted alternative to Microsoft Teams.
BigBlueButton
Open-source virtual classroom platform built for education and government: self-hosted, privacy-first conferencing with breakout rooms, whiteboards, and session recording.
Chatwoot
A mature, SOC 2-certified customer engagement platform and omnichannel dashboard. The open-source, sovereign alternative to Intercom and Zendesk.
Wire
GPL-3.0 end-to-end encrypted messaging and collaboration platform: Swiss/EU jurisdiction, ISO 27001 certified; on-premises deployment and SSO require paid Enterprise tier.
Zulip
Apache 2.0 team chat with topic-based threading: SAML, LDAP, and SCIM included at no cost; self-hosted deployment inherits your infrastructure's HIPAA and FERPA posture.
Huly
Self-hosted workspace unifying project management, documentation, and team chat in a single platform. A sovereign alternative to Linear, Notion, and Slack.
BillionMail
The self-hosted email marketing platform with a built-in MTA. A high-risk, high-reward alternative to Mailchimp that offers unlimited sending but requires strict governance oversight.
Listmonk
A high-performance, self-hosted newsletter and mailing list manager that provides enterprise-grade mass-mailing capabilities without the recurring per-subscriber tax.
Mattermost
A secure, self-hostable, open-source communication platform designed for enterprises that prioritize data sovereignty and require a private alternative to SaaS chat solutions.
Meetily
Local AI meeting assistant with zero cloud audio transit and full transcript ownership, for executives and legal teams where discussions cannot leave the device.
Jitsi Meet
Self-hosted, end-to-end encrypted video conferencing for web and mobile: no per-seat fees, no cloud dependency, and GDPR-compliant by deployment topology.
Thunderbird
Desktop email, calendar, and contacts client. Data lives on-device in standard IMAP/Maildir formats with zero lock-in to any email provider.