Here is a compiled list of 10 great tools for sys admins
1. NTFS Permissions Explorer
Using this MMC snap-in you can quickly visualize the user and group permissions of a local or remote folder or drive in a hierarchical format to help identify problems.
Whois performs a lookup of the registration information of a given IP address or domain name.
3. Xirrus Wi-Fi Inspector
Wi-Fi Inspector is a powerful Wi-Fi management and troubleshooting tool that allows you to locate and verify Wi-Fi devices, detect rogue Access Points, troubleshoot connections, and search for Wi-Fi networks.
ShareEnum allows you to scan and view the security settings of file shares on your network.
PipeList displays a list of named pipes on your system, including the number of active instances and the instance threshold.
TCPView allows you to view detailed TCP and UDP connection information in a user friendly format.
7. Microsoft Baseline Security Analyzer
The MBSA is a tool that can be used to detect missing security updates and typical security misconfigurations.
8. The Dude
The Dude from MicroTik can automatically scan all devices within a given subnet and then draw and layout a map of your network.
WireShark is an interactive network protocol analyser and capture utility. It provides for in-depth inspection of hundreds of protocols and runs on multiple platforms.
Look@LAN allows you to quickly scan your network looking for active nodes. It provides monitoring, reporting, logging and OS detection features.