What are some alternatives?
When comparing Session and Lens Distortion, you can also consider the following products
Formulas - Photo lab effects and custom frames
Carbon - Create and share beautiful images of your source code.
White Wall - Turns your digital photos into wall art
Framafoto - Custom frame your photos and digital art on iPhone
Pomodoro Time - Simple Pomodoro timer in your Mac's menu bar
TinType by Hipstamatic - Create vintage self portraits w/ Hipstamatic's new photo app