image gallery – can you help identify what plug in it is?

hi, i saw an “image gallery” at the bottom of this site:
https://healthproductreview.org/

and i want one like it. i ran a search on galleries on www.remarpro.com in extensions but i couldn’t find one like it. i know that the above site is built with wordpress. can you help me to identify the name of this extension so i can download it too? thank you!