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1. Wireshark – Powerful network analyzer
2. Notepad++ – Source code editor and Notepad replacement
3. Specops Command – PowerShell meets Group Policy
4. UBCD4Win – Ultimate Boot CD for Windows, a comprehensive rescue tool
5. XIA Configuration Server – inventory and technical documentation
6. Trinity Rescue Kit (TRK) – recover Windows using Linux
7. KeePass – Open source password manager
8. WuInstall – install Windows updates using a command line script
9. BartPE – A Windows PE-based rescue platform
10. Spiceworks – Network management
11. Desktop Central Free Windows Tools – 10 admin utilities
12. GPOExIm – Manage Group Policy Objects
13. Remote Desktop Manager – manage remote connections
14. ADManager Plus – Active Directory reports and monitoring
15. MobaXterm – The multitab Unix browser for Windows
16. SuRun – run programs with local admin rights
17. Treesize Free – Shows size of folder and subfolders
18. AnVir Task Manager Free
19. NirCmd – Swiss army knife for the command prompt
20. Simple Search – An extension for Microsoft Network Monitor
21. FileMenu Tools – Customize Windows Explorer easily
22. NetworkMiner – Network Forensic Analysis Tool (NFAT)
23. SolarWinds Advanced Subnet Calculator – IP subnet calculation made easy
24. NetWrix AD Object Restore Wizard – Create Active Directory snapshots
25. Quest Object Restore for Active Directory – Undelete AD objects
26. Sysinternals Suite – Troubleshooting utilities
27. SpecOps Gpupdate – WOL, gpupdate, remote restart
28. Process Explorer – a better Task Manager
29. Terminals – A multi-tabbed RDP client
30. Robocopy – Mirror folders
31. EventSentry Light – Real-time event log monitoring
32. TCPView – displays active TCP and UDP connections
33. Process Hacker – a mighty Task Manager and Process Explorer alternative
34. Live Maps for Microsoft Operations Manager
35. Process Monitor – view file system, registry, and network activity
36. NetWrix Active Directory Change Reporter
37. NetWrix Password Expiration Notifier
38. Revo Uninstaller – free PCs from junk
39. WMI Asset Logger – Gather computer information
40. TweakUAC – Turn off Vista UAC quickly
41. FlexTK Express – Advanced File Management Toolkit
42. Symantec NUAC – a UAC extension for Windows Vista
43. export.exe – redirect stdout output into environment variables
44. Active Directory Reporting Tool – quick overview of user states
45. CoreConfigurator – A GUI for Server Core
46. EventTracker PULSE – a search engine for log data
47. GFI LANguard – Network Security Scanner
48. MobaSSH – SSH server for Windows
49. AutoRuns – Comprehensive auto startup monitor
50. Network Monitor – a free network protocol analyzer
51. JDiskReport – displays disk space consumption
52. AdvancedRemoteInfo – gather information remotely from Windows PCs
53. NetWrix Disk Space Monitor
54. The Dude – Map networks and monitor services
55. ExInsight – Monitoring and statistics for Microsoft Exchange
56. EndPointScan – Scan your network for devices
57. NTop-XTRA – shows network usage
58. VirtualIQ – Manage Hyper-V environments
59. HealthMonitor – Monitor 60 different system states
60. Lansweeper – Hardware and software inventory for Windows
61. locate32 – Find files
62. Netcat – Swiss army knife for network troubleshooting
63. NetWrix Inactive Users Tracker
64. Sequoia View – Visualize occupied hard disk space
65. Nmap + Zenmap – Network scanner with Windows GUI
66. SolarWinds Real-Time NetFlow Analyzer
67. ShareWatch – See connected users and open files
68. AD Query – Search Active Directory
69. Secunia PSI – Scan for software vulnerabilities
70. Steel Run As – Let standard users execute with administrator rights
71. Servers Alive – A Monitoring tool
72. smartmontools – Control and monitor storage systems
73. Belarc Advisor – builds a profile of your PC
74. NetLimiter Monitor – displays transfer rates of processes
75. HashCalc – compute hash/checksums and HMACs
76. GParted – Partition manager for Windows and Linux
77. Disk2vhd – A simple P2V tool that creates VHDs for Hyper-V and Virtual PC
78. ManagePC – A inventory tool
79. GPMC PowerShell Cmdlets
80. GImageX – a GUI for ImageX
81. Defraggler – Defrag individual files and folders
82. Wizmo – control power saving functions in scripts
83. Virustotal – Analyze suspicious files
84. SoftPerfect Network Scanner – network scanning for Windows
85. ESXi Configurator Utility – backup and update VMware ESXi
86. ADModify.NET – modify multiple user accounts in Active Directory
87. SpeedFan – CPU and hard disk temperature monitoring
88. PowerTerm WebConnect for Windows Server 2008
89. Server Core Configurator – script-based Windows 2008 Server Core set up
90. PC Wizard 2008 – a system information and benchmark tool
91. VMware DiskMount GUI – Mount VMDK files
92. Hyper-V VM Mover
93. Change Analysis Diagnostic Tool for Windows XP
94. ADRestore.NET – the GUI version of ADRestore
95. Passgen – Set unique administrator passwords on multiple machines
96. Top Users Expert – Analyze bandwidth consumption with Network Monitor
97. NetWorx – Network traffic monitor and network usage reporting
98. CCleaner – Improve Windows performance by removing unnecessary files and registry entries
99. Directory Service Comparison Tool – Restore changed Active Directory objects
100. PacketTrap pt360 ToolSuite – network management
101. Sysinternals ShellRunas – run programs as different user
102. WinDirStat – Query disk usage
103. Spotlight on Windows – Monitor Windows servers
104. VistaBootPro – manage boot configuration with a GUI tool
105. 3D Traceroute – displays traceroute information in 3D
106. spacemonger v1.4 – Keep track of the free space
107. Core Configuration Console (CCC) – basic Server Core setup
108. NetWrix Services Monitor – Restart failing Windows services
109. eToolz – GUI for ping, traceroute, WHOIS and more
110. Remotely Enable Remote Desktop
111. SuperScan – an easy-to-use udp/tcp port scanner
112. NetWrix File Server Change Reporter
113. GFI WebMonitor – Web filtering for ISA Server
114. Netsetman – Switch network settings
115. compname.exe – query and rename computers
116. console – Multi-tabbed command shell enhancement
117. PlacesBar Editor – Configure the dialog places bar
118. Smart UAC – disable UAC prompts for particular programs
119. WIM2VHD – Convert a WIM image to a VHD image
120. EasyBCD – a GUI bootloader configuration tool for Vista and Windows 7
121. GiPo@FileUtilities – monitor directory changes, mount folders, and more
122. SolarWinds IP Address Tracker – Manage IP addresses
123. Windows Installer Clean Up – Resolve installation problems
124. SolarWinds Exchange Monitor
125. Hyper-V Monitor Gadget for the Windows Vista sidebar
126. Logparser – Query text-based data
127. IT Environment Health Scanner – Identify Active Directory problems
128. Real Temp – Another CPU temperature measuring program
129. PowerGUI Active Directory Recycle Bin PowerPack
130. RunAsAdmin – Run with administrative rights
131. PowerGUI – Create PowerShell scripts with a GUI
132. Iometer – measure disk performance
133. PocketPutty – SSH client for Windows Mobile
134. DELTACOPY – Incremental backup program
135. DocLock – password encryption tool for Windows Mobile
136. Recuva – Recover accidentally deleted files
137. VHD Resizer – Shrink or Expand a Hyper-V VHD
138. Ultimate Windows Tweaker – Tweak Windows Vista
139. SolarWinds VM Monitor – Get X-Ray insight into your ESX Servers
140. OpenedFilesView – view and unlock opened files
141. VHD tool – Create, convert, and extend a VHD quickly
142. DreamSys Server Monitor – Easy server monitoring
143. Necromancers Dos Navigator (NDN) – A file explorer
144. Detect Intel and AMD Hyper-V compatibility
145. Group Policy Refresh PowerShell Cmdlet
146. NT EventLog Explorer – retrieves event log information
147. Vmdk2Vhd – Convert VMware VMDK to Hyper-V VHD
148. fs guard – monitor services and directories
149. TCP Analyzer – Statistical Analysis of TCP connections in Network Monitor
150. Unstoppable Copier – Copy physically corrupt files
151. Free Registry Defrag – Defragment the Windows registry
152. Edgemeal Get and Set CPU Affinity
153. Product Key Finder – Export license keys from multiple Windows computers
154. CurrPorts – displays detailed info about open TCP/IP ports
155. mst IsUsedBy – check what process uses a certain file
156. Script Elevation PowerToys – elevate PowerShell
157. Specops Password Policy Basic – Fine-Grained Password Policies
158. WinRAP – Hide running Windows applications
159. Windows Mobile IP Utility – check IP connections
160. Delbyown – Delete, copy or list files by owner
161. AccessEnum – displays directory and registry permissions
162. AdapterWatch – comprehensive info about network adapters
163. IPNetInfo – get all information about an IP address
164. Active@ Kill Disk – hard driver eraser
165. MF Shutdown Manager – Schedule shutdowns, restarts and wakeups
166. RegAlyzer – a nifty free Registry editor
167. Compatibility Administrator – Configure legacy apps for Vista
168. EMSA Register DLL Tool – Register programs with a GUI
169. FREEping – quick and dirty monitoring

Submit your favorite free admin tool | Rate and view all tools with descriptions