DirSpace is a freeware utility from Fresh Software that calculates how much disk space certain directories (folders) are taking up on your drive. Simply enter a drive letter or root directory DirSpace will analyze its disk space usage.
Sentry locks down your computer on demand so it's secure when you aren't using it, and will take messages from people who stopped by while you were away. The program is fully customizable and can deploy to any PC you use, on your network or off.
X-NetStat displays information on your Internet and / or network connections in realtime. Details of each connection are shown in a list called the connection table, including remote hostnames and IP addresses, ports used, status, age, and program.