The DAT Group is a large UK-based Microsoft partner that is primarily known for their customized mobile applications. DAT Panther Server 2002 adds some basic functionality on top of Terminal Server. Leveraging the RDP protocol, Panther adds seamless windows, application publishing, and application-level load balancing to Terminal Server environments.
While it lacks a web application interface and some of the other features of the competing software packages, DAT Panther adds basic functionality to Terminal Server for a reasonable cost.