Fancybox - fancyapps.com - Fancy App Store
HelpDocs - Educate your users with a super simple knowledge base that’s built for teams just like yours.
PhotoSwipe - JavaScript gallery, no dependencies.
SkipFlag - AI knowledge base that builds itself from your communication
Magnific Popup - The greater part of Lightbox modules will completely preload a picture before showing it.
HelpSite - HelpSite is a simple service to help your setup the perfect support centre or help site.