Kaspars

Use PHP output buffering to extract widget output and store it into WordPress transients for faster retrieval. It also adds a checkbox to widget controls to exclude it from being cached.
It is a quick fix for bad behaving plugins that parse RSS feeds or call remote URLs on every page load.

Widget Output Cache

Improve website performance by caching widget output in WordPress transients.

Vicky Agravat

This Plugin is useful for developers blog, tutorial site where to display formatted output of any program, like C, C++, JAVA, VB, C#, JSP, ASP, PHP, HTML etc. 
The output is purely created using CSS so it is responsive, and display perfectly on any browser. 
It use shortcode to display output. Just add [output] Hello World! [/output] to your Post or Page.

Program Output

Simple plugin to display formatted output of any program.

Widget Output Cache vs Program Output