Axence nVision - Axence nVision is a professional software for the comprehensive management of the IT infrastructure in any kind of organization.
Freshservice - Freshservice: the one-stop cloud solution for all your IT management needs.
Network Scanner (LizardSystems) - Network Scanner - IP scanner for network analysis that will allow you to see all network computers in several seconds. - LizardSystems
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
Spiceworks - Spiceworks bundles network monitoring, helpdesk, UPS power management, PC inventory tools, an online community, and much more for free
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.