Execute Perl or Python or PHP online

I come across a very good site where you can run perl online and see the results.

http://www.compileonline.com/execute_perl_online.php

Advantages:
Just write the code (in the left panel) and run on the fly.
If case of any errors, it is shown on the right panel
They also prive an input.txt (in one of the tab) and practice reading/writing files
When you click on Multiple Files, it also gives support.pm, we can practice package concepts.

You can also run online Python/PHP/Java/Shell/JavaScript/HTML etc.,

Python:
http://www.compileonline.com/execute_python3_online.php

PHP:
http://www.compileonline.com/execute_php_online.php

Java:
http://www.compileonline.com/compile_java_online.php

Shell Scripting:
http://www.compileonline.com/execute_ksh_online.php

Java Script:
http://www.compileonline.com/try_javascript_online.php

HTML:
http://www.compileonline.com/try_html5_online.php

and many more on home page

http://www.compileonline.com/