Pepperfilters - Pepper's Snapchat Geofilter creator allows you to easily create a custom snapchat geofilter for your birthday, wedding or event.
Dreamscope - Make and share 'deep dream' images using dozens of supplied styles or your own.
Vidcode - Build your own Snapchat filters with code
And Then I Was Like - Express yourself with GIFs using your webcam
Snapspot - Make yourself a perfect custom Snapcode
Duotone - Convert any photo to a duotone in seconds