Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Fancybox - fancyapps.com - Fancy App Store
HelpDocs - Educate your users with a super simple knowledge base that’s built for teams just like yours.
Magnific Popup - The greater part of Lightbox modules will completely preload a picture before showing it.
Support Hero - Educate your customers through self-help support
PhotoSwipe - JavaScript gallery, no dependencies.