The sovereign alternative to Microsoft 365. High-security, self-hosted 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 219 solutions
Self-hosted workspace unifying project management, documentation, and team chat in a single platform. A sovereign alternative to Linear, Notion, and Slack.
Privacy-first, open-source knowledge management. A local-first, graph-based outliner for sovereign thought and secure enterprise intelligence.
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.
Open-core low-code platform for building internal tools and admin panels on your existing databases and APIs, under AGPL-3.0-only.
MIT-core headless CMS: design content models, generate REST and GraphQL APIs, and deliver content to any platform. SSO, audit logs, and advanced RBAC require the paid Enterprise Edition.
BSL 1.1 collaborative wiki and knowledge base. US-incorporated, CLOUD Act exposure. Commercial 'Document Service' use is prohibited without a paid license.
AGPLv3-licensed, self-hosted BI platform. Zero per-user fees, full database ownership, unlimited dashboards, without Tableau's per-seat creator licensing.
A source-available invoicing and billing suite for freelancers and agencies. Self-hostable with full feature access; white-labeling requires an annual license.
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.
The open-source low-code platform for building secure internal tools. A self-hostable alternative to Retool and Microsoft PowerApps from an ISO 27001-certified vendor.
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.
FSL-licensed conversational form and chatbot builder from France (EU). Self-hosts on Docker with PostgreSQL, with no paid plan needed.
A high-performance, self-hosted newsletter and mailing list manager that provides enterprise-grade mass-mailing capabilities without the recurring per-subscriber tax.
A secure, open-source alternative to DocuSign that enables businesses to automate document workflows and legally binding signatures with full data sovereignty.
AGPL-3.0 document management with native AES-256-GCM encryption. France-based, no CLOUD Act exposure, zero enterprise tax on self-hosted deployments.
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.
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.
GPL-3.0 AI-first note-taking app: a self-hosted second brain with RAG-powered recall on your own hardware, unlike cloud-bound Mem.ai. Built for personal knowledge management, not team collaboration.
A GPLv3-licensed, self-hostable marketing automation platform. Unlimited contacts, omnichannel campaigns, and full data ownership, without HubSpot's per-contact pricing.
Security platform for threat detection and event management across endpoints and cloud workloads, run on your own servers, under GPL-2.0-only.