JSP Viewer is a component to publish jsp's.

It's like CQ's advance web content management where you write your JSP, save and view it directly.
No deployment required.

You can do anything which can be done through JSP programming.
It's a instanceable portlet so you can have as many jsp's as you want.

Features :

1) You can insert your Jsp/Html/JavaScript/Css code into text editor.
2) Jstl Support is added. All you need to do is include required taglib.
3) All core Liferay and Plugin API can be called through Jsp scriplets.
4) Other than this you can utilize commons-io and commons-collections API of apache.
5) No need to add html/head/body tags, it works same as portlet.

Example jsp's are available on https://sites.google.com/site/jspviewerwithliferay/

Source is available so if you want to support more libraries then go ahead.

Hope community will like it :)