Howtoforge posted a guide about installing OCS Inventory NG Server 2 on CentOS 5.5

This article explains how to install OCS Inventory NG Server 2 on Linux Server. OCS Inventory is a great software to make inventories. The NG Server is formed by: communication server, deployment server,and administration console. The computers that will be inventoried must run an agent (installed on each computer), to connect to the OCS NG Server. We are using the CentOS 5.5 (64bits) distribution, but it will probably work on Fedora (and Red Hat, for sure).

  How To Install OCS Inventory NG Server 2 On CentOS 5.5