Duotone - Convert any photo to a duotone in seconds
Pepperfilters - Pepper's Snapchat Geofilter creator allows you to easily create a custom snapchat geofilter for your birthday, wedding or event.
Zombocam - Filters and effects for your webcam
Snaptag Editor - Create your own custom Snapchat code 👻
Dreamscope - Make and share 'deep dream' images using dozens of supplied styles or your own.
Vidcode - Build your own Snapchat filters with code