Super RSS Reader is jQuery based RSS reader widget.
https://wordpress.org/plugins/super-rss-reader/
Widgets · WordPress Plugins
Get access to data on 42,559 websites that are Super RSS Reader for WordPress Customers. We know of 12,483 live websites using Super RSS Reader for WordPress and an additional 30,076 sites that used Super RSS Reader for WordPress historically and 6,647 websites in the United States.
Get a list of 42,559 websites using Super RSS Reader for WordPress which includes location information, hosting data, contact details, 12,483 currently live websites and an additional 6,952 domains that redirect to sites in this list. 30,076 sites that used this technology previously and 6,647 websites in the United States currently using Super RSS Reader for WordPress.