Magnific Popup - The greater part of Lightbox modules will completely preload a picture before showing it.
Freshdesk - Freshdesk is a cloud-based customer support software that lets you support customers through traditional channels like phone and email, social channels like Facebook and Twitter, and your own branded community
jQuery Lightbox - jQuery Lightbox plugins are utilized to showcase images and other web stuff using modal dialogs.
Zoho Desk - Industry's first context-aware Helpdesk Software
Fancybox - fancyapps.com - Fancy App Store
Salesforce Service Cloud - Service Cloud integrates customer service with social networks and provides a self-service customer portal and knowledge base system.