Zendesk - Zendesk is a beautiful, lightweight help-desk solution.
NetBox - NetBox is an open source web application designed to help manage and document computer networks. NetBox was developed specifically to address the needs of network and infrastructure engineers.
Freshservice - Freshservice: the one-stop cloud solution for all your IT management needs.
Snipe-IT - Managing assets with a Google doc or a shared Excel spreadsheet is more common than you think.
ServiceNow - ServiceNow automates and manages global enterprise service relationships. Create a single system of record for enterprise services, automate manual tasks, consolidate legacy ITIL systems.
Zabbix - Track, record, alert and visualize performance and availability of IT resources