Built with HTML5, performance and accessibility in mind, WS Form Lite is definitely worth a closer look.
Search post, pages and custom post types, using this highly configurable live search plugin.
Another form builder with good Gutenberg support, build in style editor and focus on performance.
You can display pdf files as an animated flipbook with page turning sound effects :o
Show images, galleries and videos in a lightbox with minimum effort and possible improved privacy.
Filter out comment spam quietly and automatically while ensuring privacy.