Snapseed - Snapseed is a photo enhancement and sharing app with a powerful suite of imaging filters and tools...
VWO - Use VWO to tweak, optimize & personalize your website with minimal IT help.
Vignette - Vignette: Add film and camera effects to your photos. • 68 effects & 56 frames
Optimizely - A/B testing you'll actually use.
Paper Camera - Paper Camera is the BEST Sketch/Cartoon app in the App Store.
Crazy Egg - Through Crazy Egg's heat map and scroll map reports you can get an understanding of how your visitors engage with your website so you can boost your conversion rates.