Our detectives are back with the following intel on this WordPress site
The site is using the OnePress theme by FameThemes .
We could identify 5 plugins (there might be more) - Contact Form 7 , slider-animator-premium , Sticky Menu, Sticky Header (or anything!) on Scroll , Tabs Widget for Page Builder and WP Super Cache
OnePress is an outstanding creative and flexible WordPress one page theme well suited for business website, portfolio, digital agency, product showcase, freelancers and everyone else who appreciate good design. The theme overall is an elegant and classic one, a fine example of Bootstrap 4 WordPress theme which compatibility with latest version of WooCommerce. (Live preview : http://www.famethemes.com/preview/?theme=OnePress)
Sticky Menu or Sticky Header lets you stick any element at the top of the screen when you scroll, or create a floating menu.