NT Server

Georgia SoftWorks Windows NT Telnet Server
Telnet server for Windows NT that supports data stream encryption, network enable DOS legacy applications with color support, downloadable 30-day trial, by Georgia SoftWorks.
http://www.georgiasoftworks.com/

Hyena
Provides Windows NT administrators a single, centralized interface for system management functions. Working with one or more domains, NT/2000 administration is simplified. Object and hierarchical list displays.
http://www.systemtools.com/hyena/

Microsoft Corp.: Windows NT Server 4.0
MS official page, containing product information, technical resources, downloads, support and links to related sites.
http://www.microsoft.com/ntserver/

NeoHIGH
Software to coordinate two servers, forming highly available NT server clusters. When one server is down or unavailable, the peer server will take over automatically and transparently. Users experience only a short response delay, the interrupted service is accessible within a minimal time frame.
http://www.neohigh.com/