Total Network Inventory - Total Network Inventory is a piece of software designed to help with managing software inventory and auditing PC systems.
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
Spiceworks Help Desk - Help desk software features that work for IT
Zendesk - Zendesk is a beautiful, lightweight help-desk solution.