Porky Port Scanner is light weight TCP and UDP port scanner for windows that also performs host discovery.
No installation nessasary - just run Porky Port Scanner straight from the exe and start scanning!
Simple Shutdown Scheduler (also named 'SSS') is a light and useful tool to schedule shutdowns/reboots/... for any computer in your network. It's free, open source, light, simple to use, secure and it ALWAYS WORKS.
Process Sniper is a light tool which allows to get information about a specific process by dragging the mouse on one of its windows. Process Sniper can also kill, set priority/affinity, pause/resume the process... etc.