Wireshark - Wireshark is a network protocol analyzer for Unix and Windows. It lets you capture and interactively browse the traffic running on a computer network.
Zabbix - Track, record, alert and visualize performance and availability of IT resources
netcat - Netcat is a featured networking utility which reads and writes data across network connections...
ManageEngine RecoveryManager Plus - RecoveryManager Plus is one such enterprise backup solution which has the ability to easily backup and restores both the domain controllers and virtual machines.
tcpdump - tcpdump is a common packet analyzer that runs under the command line.
Lastpass - LastPass is an online password manager and form filler that makes web browsing easier and more secure.