openDesk
Germany's government-built alternative to Microsoft 365. A Kubernetes-based suite integrating Nextcloud, Element, OpenProject and Collabora, stewarded by a state-owned company for the public sector.
Collaboration
Category: Collaboration under Digital Workplace
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.
Nextcloud
A self-hosted alternative to Microsoft 365: files, calendars, mail, chat and office in one suite, with every byte on infrastructure you control. Enterprise hardening and support are a paid subscription.
CryptPad
Zero-knowledge encrypted office suite (docs, sheets, slides, forms): the server stores only ciphertext, so even the admin can't read your files. AGPL, EU-based; the full suite is free, only managed hosting is paid.
Overleaf
AGPLv3 self-hosted collaborative LaTeX editor for academic and scientific writing. The free Community Edition omits SSO, per-user sandboxing, and Git sync, which sit behind the paid Server Pro tier.
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.
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.
Zed
GPL-3.0 code editor: native Rust binary, zero telemetry, BYOK AI keeps source code off Zed's infrastructure. No compliance certs; local-only mode required for regulated environments.
AFFiNE
The local-first workspace that unifies docs, whiteboards, and databases into a single, privacy-focused alternative to Notion and Miro.
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.
Collabora Online
The sovereign alternative to Microsoft 365. High-security, ISO 27001-certified online office suite designed for data sovereignty and government-grade privacy.
Huly
Self-hosted workspace unifying project management, documentation, and team chat in a single platform. A sovereign alternative to Linear, Notion, and Slack.
Baserow
MIT-core no-code database platform: unlimited records, no per-row pricing, full relational backend. A self-hostable Airtable alternative; advanced roles and premium plugins require paid plans.
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.
Docmost
An open-source, self-hosted alternative to Notion and Confluence, providing real-time collaborative documentation and wikis with complete data sovereignty.
Excalidraw
A virtual whiteboard for sketching hand-drawn like diagrams. End-to-end encrypted, instant, and privacy-first.