ActiveXperts Network Monitor 2015 proactively manages network servers, devices, databases and more.

Microsoft Resource Kits - Windows 2003 Resource Kit

Adlb.exe  (Windows 2003 Resource Kit)

The Window Server 2003 Resource Kit is a set of tools that system administrators and engineers use to manage or support a Windows Server 2003 system. Use it to streamline management tasks such as troubleshooting operating system issues, managing Active Directory, configuring networking and security features, and automating application deployment.
Adlb.exe - Active Directory Load Balancing Tool
The Active Directory Load Balancing (ADLB) rebalances the load each time a change occurs in your site topology or in the number of domain controllers you have. ADLB can stagger schedules so that the outbound replication load for each domain controller is spread out evenly. Good for balancing replication traffic between the Windows 2003 domain controllers when they are replicating to more than 20 other sites hosting the same domain.