Here is a list of some of the most useful tools that I use on a daily basis as an IT professional.
Spiceworks is a free IT management software that includes things like network inventory, alert management, and a helpdesk functions. Spiceworks is technically adware but they are IT ads for printers, IT equipment etc.
The Ultimate boot cd for Windows is a great tool. This is actually a bootable cd that can launch you into an operating system environment that can be used when your Windows installation won’t boot. This tool is great for troubleshooting, running diagnostics and recovering data.
Logmein rescue is a subscription service similar to Logmein but oriented more for a support professional. The rescue services allows me to control a users PC without having to have preinstalled software on their PC. They go to a website and enter a code and I’m connected within minutes.
Gnome Partition Editor or Gparted formerly partition magic, is a Linux based live cd that allows you to edit partitions from an OS type environment. One of the great thing that you can do with this is resize Windows partitions after Windows is installed. This is useful if you want to image your install on to a larger harddrive.
A USB harddrive connector can be a handy tool to recover data from a drive where the operating system won’t boot, or if there is a hardware problem with the original equipment. This little devices has saved me a great deal of time.