Kai A. Hartung
ToolJet
The open-source low-code framework for React developers. A SOC 2 Type II compliant alternative to Retool with air-gapped deployment capabilities.
Outline
The beautifully designed, source-available team knowledge base. A self-hosted alternative to Notion and Confluence for teams who value documentation speed.
Metabase
The easiest way for teams to ask questions of their data. An open-source BI tool that democratizes analytics for non-technical users.
InvoiceNinja
The leading open-source invoicing and billing platform for freelancers and agencies. A powerful, self-hostable alternative to FreshBooks and QuickBooks.
ClickHouse
The fastest open-source OLAP database on earth. A real-time analytics powerhouse that replaces Snowflake and BigQuery for petabyte-scale data.
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.
Rocket.Chat: Why the world's most secure organizations are trading SaaS convenience for digital sovereignty
Slack and Teams offer convenience, but at what cost? For organizations that can't afford to lose control of their communications, Rocket.Chat is the standard-bearer for sovereign collaboration. Here is why the world's most security-conscious teams are making the switch.
Typebot
A visual, no-code chatbot builder that lets you create advanced conversational apps and embed them anywhere (Web, WhatsApp) with high conversion rates.
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
A simple, modern, and user-friendly document management system (DMS) for organizing your digital life.
OpnForm
An open-source, privacy-first form builder offering a beautiful, Notion-like interface as a sovereign alternative to Typeform.
Odoo
The giant of Open Source ERPs. Powerful but complex, with a significant feature gap between the Free Community edition and the Paid Enterprise version.
ERPNext
The 100% Open Source alternative to Odoo. A monolithic ERP with Accounting, HR, and Manufacturing included out of the box.