uwcals

Enables WordPress to include thumbnail and custom field data in its RSS2 feed.
How is works:
<ul>
<li>To retrieve post thumbnails: Add “post_thumbnail=1” to your feed’s link. (e.g. “http://www.mywpsite/feed/?post_thumb=1”)</li>
<li>To retrieve custom fields: Add “meta_keys=meta_name1[,meta_name2,meta_name3,…]” to your feed’s link (e.g. “http://www.mywpsite/feed/?meta_keys=post_quote,post_contributor” will retrieve the “post_quote” and “post_contributor” custom fields’ value, if these fields have been added to the post.)</li>
<li>To further customize your feed: use any other WP Feed options, as listed on https://codex.wordpress.org/WordPress_Feeds/.</li>
</ul>
Example: 
The http://news.cals.wisc.edu/feed/?cat=67&post_thumb=1&meta_keys=academic_info will retrieve all posts in category 67, along with their thumbnails (if available) and the value of the ‘academic_info’ field (if available).

UW CALS Extend RSS2 feed

Enables WordPress to include thumbnail and custom-field data in its RSS2 feed

Replaces the default WordPress search with Google Custom Search Engine (CSE) (http://www.google.com/cse/). An active Google CSE account is required to enable this plugin.

UW CALS Google Custom Search Engine

Replaces the default WordPress search with Google Custom Search Engine (CSE).

UW CALS Extend RSS2 feed vs UW CALS Google Custom Search Engine