Collabora Online
The sovereign alternative to Microsoft 365. High-security, ISO 27001-certified online office suite designed for data sovereignty and government-grade privacy.
Open Source Alternatives: The Sovereign Stack
A curated database of vetted open source alternatives to proprietary SaaS. Find tools that are safe, compliant, and ready for business.
Showing of 125 solutions
Huly
Self-hosted workspace unifying project management, documentation, and team chat in a single platform — a sovereign alternative to Linear, Notion, and Slack.
Logseq
Privacy-first, open-source knowledge management. A local-first, graph-based outliner for sovereign thought and secure enterprise intelligence.
Kimai
An EU-native, AGPL-3.0-licensed time-tracking and invoicing suite for professional services. Self-hostable with full GDPR data residency and zero US CLOUD Act exposure.
ToolJet
AGPL-3.0 low-code framework for building internal tools and admin panels — proxy architecture keeps business data in your own databases, not ToolJet's.
Outline
BSL 1.1 collaborative wiki and knowledge base. US-incorporated, CLOUD Act exposure — commercial 'Document Service' use is prohibited without a paid license.
Metabase
AGPLv3-licensed, self-hosted BI platform. Zero per-user fees, full database ownership, unlimited dashboards — without Tableau's per-seat creator licensing.
Invoice Ninja
A source-available invoicing and billing suite for freelancers and agencies. Self-hostable with full feature access; white-labeling requires an annual license.
ClickHouse
Open-source OLAP database benchmarked as the fastest for real-time analytics at petabyte scale — a self-hosted alternative to Snowflake and BigQuery with no query-based pricing.
Budibase
The open-source low-code platform for building secure internal tools. A highly compliant, ISO 27001-certified alternative to Retool and Microsoft PowerApps.
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.
Typebot
FSL-licensed conversational form and chatbot builder from TYPEBOT SAS (France, EU) — self-hostable on Docker with PostgreSQL; SSO and WhatsApp integration require paid tiers.
Listmonk
A high-performance, self-hosted newsletter and mailing list manager that provides enterprise-grade mass-mailing capabilities without the recurring per-subscriber tax.
DocuSeal
A secure, open-source alternative to DocuSign that enables businesses to automate document workflows and legally binding signatures with full data sovereignty.
Papra
AGPL-3.0 document management with native AES-256-GCM encryption. France-based, no CLOUD Act exposure — zero enterprise tax on self-hosted deployments.
OpnForm
AGPLv3 open-core form builder. France-based, no CLOUD Act exposure, self-hostable via Docker — without Typeform's per-response fees or data held hostage on vendor servers.
NocoDB
Source-available no-code layer for existing SQL databases. Zero record limits, auto-generated REST APIs — without Airtable's per-record pricing or proprietary data lock-in.
Blinko
An open-source, AI-first personal knowledge management tool featuring RAG-powered recall and a sovereign second brain architecture.
Mautic
A GPLv3-licensed, self-hostable marketing automation platform. Unlimited contacts, omnichannel campaigns, and full data ownership — without HubSpot's per-contact pricing.
Wazuh
GPL-2.0 unified XDR and SIEM platform from Wazuh, Inc. — all capabilities including RBAC, threat hunting, and compliance mapping modules included in the open-source binary; paid tier is managed cloud only.