Debiprasad Sahoo

This is a very simple sidebar widget which places javascript code in the widget. In this plugin, you need to provide the url of the javascript and this plugin will use that js file source.
If you want to put any JavaScript code inside the <code><script></code> tag, then try my <a href="https://wordpress.org/extend/plugins/javascript-block-widget/" title="JavaScript Block Widget plugin" rel="ugc">JavaScript Block Widget plugin</a>.
You can also able to add JavaScript codes in text widget in sidebar. So you don’t need this plugin.
<h3>Usage</h3>
BidVertiser Ads 
BidVertiser Ads codes provide an URL of JavaScript code, which you need to include as the source in a JavaScript block. Get the url from the code generated from BidVertiser and provide while editing the widget values and you can see the ads in this sidebar widget.

Include JavaScript Widget

Allows you to insert any javascript code from a js file to your Wordpress widget

jchan

This adds Javascript search widgets to any droplists on the website. It allows users to search the contents of the list, and filter out items that do not match. Useful for longs or unsorted lists.
This has been tested on the following browsers: Safari, Firefox 2, Firefox 3, and IE6. There were problems with the appearance of the search textbox on certain browsers in the older version. That should be fixed now.
See http://joshuachan.ca/home/droplist-filter for demonstration.
<h3>Arbitrary section</h3>
Copyright 2008 Joshua Chan
This plugin acts as a wrapper for the Droplist Filter Javascript class, 
which is included with this package in the “droplistFilter” subdirectory. It 
is possible to use that independently from WordPress. See the documentation in 
the subdirectory for more information.
Any graphics images included with this package are for example purposes only 
and are copyright their respective owners.

Droplist Filter

This adds Javascript search widgets to any droplists on the website.

Include JavaScript Widget vs Droplist Filter