GLPI - GLPI is the Information Resource-Manager with an additional Administration- Interface.
Freshservice - Freshservice: the one-stop cloud solution for all your IT management needs.
Lansweeper - Lansweeper discovers Windows, Linux and Mac machines in your network.
Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
FusionInventory - Fork of the OCS Inventory project that enables users to inventory their IT assets.
SolarWinds Service Desk - An IT service management (ITSM) solution that understands what it takes to successfully manage your employee services. Try Solarwinds Service Desk for free!