Malware Bytes Anti-Malware
Link: https://www.malwarebytes.org/

This is great for finding and removing a variety of malicious software (malware). Malware comes in two forms, the first of which is very serious and can allow remote control of your system. These are known as Trojans and normally enter your system through the guise of being a legitimate piece of software or a link. The second type of malware is normally referred to as a Potentially Unwanted Program, or PUP. These are bits of software, for example toolbars for Internet Explorer, which clog up your computer and slow it down. Malwarebytes is a great tool for removing both of these.

PuTTY
Link: http://www.chiark.greenend.org.uk/~sgtatham/putty/latest.html

PuTTY is a great little tool that allows you to connect to devices using multiple protocols such as Telnet and SSH. A must have for anyone who deals with advanced networking hardware or VMWare Virtualisation.

Hiren’s Boot CD
Link: http://www.hirensbootcd.org/download/

Hiren’s Boot CD is a must have for any IT tech. This bootable iso comes loaded with tools and apps that help with troubleshooting and repairing computers. Some of the tools included range from RAM and HDD test to an offline password reset for Windows in case the system is locked out. You can find a full list of the tools included on the CD by visiting the site on the link provided.

Macrium Reflect Free
Link: http://www.macrium.com/reflectfree.aspx

Macrium Reflect Free is a great image backup software. The free edition for Desktop OS offers a great way to backup your entire computer and even allows scheduled differential backups. This means that you can take regular backups but set the schedule so that only changes are backed up (differential). The advantage of this is that you can store multiple restore points using less storage capacity.

TreeSize Free
Link: https://www.jam-software.com/treesize_free/

TreeSize Free is a great tool for enumerating files on a disk and finding out what is using up all your hard drive space!

Advanced IP Scanner & Advanced Port Scanner
Link: http://www.advanced-ip-scanner.com/
Link 2: http://www.advanced-port-scanner.com/

These are both network discovery tools. Advanced IP scanner is great for finding out what is on the network and determining the IP address of a device. Advanced Port Scanner takes it one step further and finds out what ports are open on devices within the network and can even find out the version of application using those ports.

File Transfer Speed Test
Link: http://totusoft.com/lanspeed1/

File Transfer Speed Test allows you to test the rate at which files are transferred between two hosts on your network. This is great for testing transfer speeds to a NAS drive or to a network shared folder.