Software by AnywhereTS.com:

Completely free thin client solution for Windows. Converts PCs to thin clients. Allows you to customize and deploy clients completely from within a Windows environment. In less than 5 minutes it is possible to setup a complete thin clients solution on your server with fast, free clients that boot from the server or from local CD. Supports Thinstation, RDP and booting from network (PXE), floppy, CD or flash.