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 110 solutions

Matomo

Matomo

A GPLv3-licensed, self-hosted web analytics platform. A privacy-first alternative to Google Analytics with full data sovereignty and GDPR-native architecture.

OpenBB

OpenBB

AGPLv3-licensed AI financial research platform. Full data sovereignty, zero terminal seat fees — without Bloomberg's proprietary data lock-in.

Krayin CRM

Krayin CRM

Self-hostable CRM for managing leads, contacts, and sales pipelines — a Laravel-based alternative to Salesforce with full data sovereignty.

Zulip

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

Collabora Online

The sovereign alternative to Microsoft 365. High-security, ISO 27001-certified online office suite designed for data sovereignty and government-grade privacy.

Kimai

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

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.

Strapi

Strapi

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.

Outline

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

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

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

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

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

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

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

DocuSeal

A secure, open-source alternative to DocuSign that enables businesses to automate document workflows and legally binding signatures with full data sovereignty.