Kai A. Hartung

Kai A. Hartung

GPL-3.0 search engine: single C++ binary with Raft clustering, vector search, and typo tolerance included at no cost. SOC 2 Type II and HIPAA verified for Typesense Cloud.

Headless commerce API for web, mobile, and POS from a single GraphQL core. All platform features in the open-source release; no paywalls.

POCL-licensed PIM, MDM, and DAM platform. Austria-based, EU jurisdiction. A €5M revenue threshold triggers mandatory commercial licensing with no open-source exit path.

AGPL-3.0 IT asset management system: tracks hardware, licences, accessories, and consumables with no user or asset limits. No feature paywalls; SLA support and priority fixes require a paid plan.

MIT-licensed, self-hosted uptime monitoring and status page tool: HTTP/S, TCP, DNS checks with 90+ notification channels; single-instance architecture with no RBAC or multi-region polling.

MIT-core identity provider for SSO, LDAP federation, SAML, and OIDC. It unifies authentication across your entire stack. Advanced compliance features and SLA support require the Enterprise edition.

Source-available, self-hosted workflow automation platform. Unlimited executions, full data sovereignty, no per-task fees. All without Zapier's volume pricing or cloud exposure.

BSD-3-Clause backend-as-a-service: auth, database, storage, functions, and real-time subscriptions in one self-hosted platform. A sovereignty-first alternative to Google Firebase.

Self-hosted BI platform with a semantic layer, 40+ chart types, and no per-seat fees, a SQL-first alternative to Tableau and PowerBI at petabyte scale.

MIT-licensed headless commerce engine. Zero GMV tax, full database ownership, no revenue sharing, for B2B and DTC architectures that Shopify Plus cannot accommodate.

MIT-core secret management platform: end-to-end encrypted secret syncing across your entire infrastructure. SSO, RBAC, and audit logs require the Enterprise edition.

AGPL-3.0 self-hosted alternative to Google Photos: automatic mobile backup, facial recognition, and timeline search with no cloud dependency or per-storage fees.

AGPL-3.0 customer feedback platform: surveys, NPS scoring, and in-app widgets with full data ownership and zero per-response fees.

MIT-core application observability: unified APM, logs, and traces via OpenTelemetry, with no per-host or ingestion fees. SAML SSO and RBAC require the Enterprise Edition.

A secure, self-hostable, open-source communication platform designed for enterprises that prioritize data sovereignty and require a private alternative to SaaS chat solutions.

The open-source standard for Identity and Access Management (IAM), offering complete sovereignty over user data, federation, and SSO infrastructure without per-user licensing costs.

Open-source backend-as-a-service built on PostgreSQL: database, auth, file storage, and real-time subscriptions in a single platform. SSO and HIPAA BAA require a paid plan.

MIT-core product analytics platform: event tracking, session replay, feature flags, and A/B testing unified. RBAC and SAML are gated behind paid enterprise add-ons.

AGPL-3.0 IAM platform from Switzerland. SOC 2 Type II and ISO 27001:2022 verified on the SaaS tier; self-hosted edition has no MAU limits, B2B multi-tenancy and SAML included.