Cygwin - Cygwin is an extraordinarily useful application that creates a unix-like environment on your Windows system.  Most common Linux/UNIX tools are available.

SysInternals - This is a collection of Windows utilities maintained by Microsoft.

FreeFileSync - This tool will compare two Windows directories and synchronize the files inside them.

Daemon Tools Lite – Daemon Tools Lite is a utility that lets you take an ISO image on your hard drive and “mount” it onto a virtual CD/DVD drive without having to write it to physical media.

Ketarin - Ketarin is a utility that will keep installation packages updated with the latest version of files.  For instance, if you keep a USB drive loaded with various applications, Ketarin can be made to monitor each application’s web site, detect a new version and update the installation package on your USB drive.

There are a number of sites that let you select various freeware and open source Windows applications and download/install them in a single bundled package.

Ninite – Ninite does not have as broad of a selection of applications to choose from, but they are very picky about which apps to include, such that adware, tool bars, etc, are not included in the titles they distribute.

AllMyApps

FreeApps

Useful Windows Utilities is a post from: Information Technology Management