Total Network Inventory - Total Network Inventory is a piece of software designed to help with managing software inventory and auditing PC systems.
GLPI - GLPI is the Information Resource-Manager with an additional Administration- Interface.
Lansweeper - Lansweeper discovers Windows, Linux and Mac machines in your network.
Spiceworks Help Desk - Help desk software features that work for IT
FusionInventory - Fork of the OCS Inventory project that enables users to inventory their IT assets.
Kuwaiba - Kuwaiba is an open source, enterprise grade network inventory and CMDB for your telecommunications and IT infrastructure