Rick Beckman

Adds to search results and archive pages the total number of posts available as well as an indicator as to which batch of posts are currently being displayed, for example “11-20 of 124.” This plugin is a remix of <a href="https://wordpress.org/extend/plugins/results-count" rel="ugc">Results Count</a> by Matthew Taylor, and it is optimized for <a href="http://get-thesis.com/" rel="nofollow ugc">the Thesis theme framework</a>.
Say you have a category named “Videos” with 432 posts; visiting the third page of that archive would show you posts 21-30 (assuming 10 posts per page); with this plugin, this information would be available to your users at a glance:
<pre><code>21–30 of 432 entries categorized:
<h1>Videos</h1>
</code></pre>
Search results and the following archive types are taken into account by this plugin: day, month, year, author, category, and tag.

Results Count Remix

Adds both the number of displayed posts as well as the total number of returned posts to search and archive pages.

cleanscript

A very simple plugin that provides information about the Custom Page Templates available in the theme: What they are, which are not used and where the used ones are used, selectively.
Main features: 
Available page templates list 
Unused page templates list 
List of page templates with checkboxes that output when submitted the links where they are used

Cleanscript – Page Templates Info

Find information about your page templates. What they are, which are not used and where the used ones are used, selectively.

Results Count Remix vs Cleanscript – Page Templates Info