Here’s a list of tools I recommend
Wireshark is a free and open-source packet analyzer. It is used for network troubleshooting, analysis, software and communications protocol development, and education.
Available here for Windows and OSX operating system.
If you are under a GUI operating system you can use your favorite internet browser and go to : http://whatismyip.com/ to discover your public IP
But if you are working in a line command environment *NIX or OSX operating system run this command:
$ curl ifconfig.me
SpeedTest is a free broadband connection analysis website to test your insternet speed
CoRD is a Mac OS X remote desktop client for Microsoft Windows computers using the RDP protocol. It’s easy to use, fast, and free for anyone to use or modify. You can use to save your credentials to easily access your hosts the next time.
FastSCP is the simplest and fastest way to move VMs and templates between datastores or to deliver ISO files to ESX Servers,it allows you to copy files from ESX to Windows, Windows to ESX, or directly ESX to ESX.
Notepad++is a free source code editor which supports several programming languages running under the MS Windows environment.
Getif is a free SNMP browser multi-functional Windows GUI based Network Tool.
KeePass is an open source, multi-platform, light-weight and easy-to-use password manager.
top a *NIX command that provides an ongoing look at processor activity in real time. It displays a listing of the most CPU-intensive tasks on the system, and can provide an interactive interface for manipulating processes.
Nmap (Network Mapper) is a security scanner used to discover hosts and services on a computer network.
Dstat is a “versatile resource statistics tool”, it replace a host of individual utilities such as vmstat, iostat, netstat and ifstat. It gives you detailed selective information in columns and clearly indicates in what magnitude and unit the output is displayed. Less confusion, less mistakes. And most importantly, it makes it very easy to write plugins to collect your own counters and extend in ways you never expected.
And you what is your favorite tools?