Axence netTools - Axence netTools is completely free of charge, both for home and commercial use – all you have to do is to register. A tool for professionals – and others.
Zoom - Equip your team with tools designed to collaborate, connect, and engage with teammates and customers, no matter where you’re located, all in one platform.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
WebEx - Cisco WebEx Web Conferencing, Online Meetings, Desktop Sharing, Video Conferencing
Spiceworks - Spiceworks bundles network monitoring, helpdesk, UPS power management, PC inventory tools, an online community, and much more for free
Skype - Stay in touch with your family and friends for free on Skype. Download Skype today to chat and call on desktop and mobile.