Filtron - Create and share your own photo filters on Mac & iPhone
iZap - piZap Photo Editor is fun and easy to learn online photo editor & collage maker. Tons of effects, fonts, stickers, collage layouts, borders, frames, and editing tools.
CSSCO - VSCO Filters with CSS
IMG.LY - Power Your Apps with IMG.LY | The Leading Provider of Design, Photo, and Video Editing SDKs
Instagram.css - Complete set of Instagram filters in pure CSS
Bazaart - Create. Discover. Love. Social photo collage editor