What are some alternatives?
When comparing Eyes Of Network and ZenDesk, you can also consider the following products
DiamanteDesk - DiamanteDesk is an open-source easy-to-use help-desk solution.
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
openITCOCKPIT - openITCOCKPIT is an open source out of the box monitoring framework. It can be installed on Debian based distributions through apt and provides a user friendly web interface where you can create all your hosts and services you like to monitor.
LiveAgent - LiveAgent is a fully-featured web-based live chat and helpdesk software. It harnesses the power of a universal inbox, real-time live chat, built-in call center, and a robust customer service portal. Start you free 14-day trial today.
Spiceworks Help Desk - Help desk software features that work for IT
HelpScout - Help Scout is a simple, straightforward way to provide excellent support