What is the largest using software for warehouse management?

In my experience , ERP covering the best inventory and processing techniques.

BAAN , ORION are the oracle based ERP Software which can give complete solution for the warehouse management 

I agreed with Mr.Shaik most companies use ERP systems Baan, infore And others those systems not cover all process perfectly because not automated you have to enter location , quantity, exp , batch ..... etc manual and user most times doing mistakes " humans errors" Warehouses need automated system" live " to avoid mistakes and increase the efficiency.

sap warehouse management is the largest software using in warehouse management

There are more..But most User friendly is ORACLE Based ERP's  

As far as I know base on my experience, I think WMS(Warehouse Management System) is the best and largest used software for Warehouse management industries.Also, there is ERP, SAP, EBS, ILS...