In 2013 we created a huge ERP system for Wobtalk company (Germany). We are still working on enchencements for this system. Currently database counts around 700 tables. Last milestone was to integrate the system with phone network around the company departments.
The system consists of many modules, for example warehouses, worker management, work plan and time tracking, customer service, printing receipts, invoices and bills, CRM module and more. This ERP is still expanding by two PHP developers.