This puppy of yours uses:
- Lightbox for its gallery
- Ampproject for Accelerated Mobile Pages
- Bootstrap as web framework
- LiteSpeed as webserver
- Unpkg as CDN
- jQuery 3.3.1
- Google Font API with font Poppins
- Google AdSense
- Google Analytics
- Google Tag Manager for tag manager
- and runs PHP 7.2.19 which makes me suspect the server platform is Ubuntu 18.094LTS.
Damned if I know which script it is but looking at the CSS I suspect it is an existing pre-fabricated script.
HtH!
--straycat