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.
Face++ - API for face detection – also detects gender, age, pose
Bazaart - Create. Discover. Love. Social photo collage editor
Facesoft - The world's most accurate face recognition algorithm
PhotoRoom - Create studio-quality product pictures in seconds.
Facial Recognition by FB - Get notified if someone tries to use your photo on Facebook