MyCompany ERP
Open-source ERP & CRM for small business — self-hosted, no user fees
...It combines inventory, invoicing, manufacturing, sales, purchasing, project management, HR and retail POS in one system with a single database. It runs self-hosted on your own server (Linux, Windows or Docker) with no per-user fees or feature limits. Built on the open-source lsFusion platform (Java + PostgreSQL), it can be customized from small field-level tweaks to entirely new modules.
Development happens on GitHub (this is a mirror): https://github.com/lsfusion-solutions/mycompany
Live demo (no login): https://demo.lsfusion.org/mycompany/
Documentation: https://mycompany-docs.lsfusion.org/
lsFusion platform: https://lsfusion.org/