This emulator is created at AT&T.
This emulator lets you execute almost all UNIX commands at prompt.
This emulator supports shell scripts also.
That is you can practice all UNIX(Linux) commands on your machine.
No need to install Linux on your machine.
This software is written in C and available commercially also.
To download copy this url in address bar of your brower
http://www.research.att.com/tmp/reuse/pkgBAAa1M30u/uwin_base.win32.i386.exe
Download Size:-About 8 Mb app..

This software is a product of Eversoft.
This is an excellent tool to create web pages and also to learn HTML.
Gives list of all html tags and its all attributes

Notes for C language students provided by Karnataka state open university.
Worth your attention. Check it out.