Fancybox - fancyapps.com - Fancy App Store
Memeto - Memeto is a meme maker app that lets you create your own customizable memes.
PhotoSwipe - JavaScript gallery, no dependencies.
Musaic Box - Melodious music box puzzler game
Magnific Popup - The greater part of Lightbox modules will completely preload a picture before showing it.
Resynth - Relax, remix and restore with Resynth, a minimal musical puzzler.