ActiveXperts Network Monitor 2019 proactively manages network servers, devices, databases and more.

Microsoft Resource Kits - Windows 2000 Resource Kit

Usrmgr.exe  (Windows 2000 Resource Kit)

The Windows 2000 Resource Kits help IT professionals deploy, manage, and support Windows 2000 operating systems.
There are a number of Windows 2000 Resource Kit software tools available for free download from Microsoft. These tools are listed below, and can help you streamline administrative tasks such as managing Active Directory™, administering security features, working with Group Policy and Terminal Services, automating application deployment, and other important jobs.

Usrmgr.exe - User Manager for Domains
Use this GUI-based tool to manage security for Microsoft® Windows® 2000 Professional and Microsoft® Windows NT® version 4.0 domains, member servers, and computers. It enables you to manage a Windows NT 4.0 domain from a Windows 2000 computer.